Stepanoff,A.J. (1957),Centrifugal and Axial Flow Pumps,2nd Edition
Lobanoff,V.S. & Ross,R.R. (1985), Centrifugal Pumps - Design and Application, Gulf Publ.
Church,A.H.(1944), Centrifugal Pumps and Blowers, John Wiley & Sons
Pfleiderer,C. (1961)Kreiselpumpen etc (in German)Springer-Verlag                         

There are also some short articles or papers that have been published which provide at least a starting point into centrifugal pump design and sometimes much more. Some of them give concise summaries of Stepanoff's method or use his and/or Pfleiderers constants along with other methods. Here they are:
1. Makay,E. (1971), Design of Fluid Movers - Centrifugal Pump Expertise for the Nonexpert (This is a part of Franklin Institute Report No. C2929-01, 3/71, Design Evaluation Guide - Primary Coolant Pumps for Water Cooled Reactors)
2. Ming,Z. (1989), Application and Experimental Investigation  of Two-Dimensional Flow Theory in the Design of a Submerged Pump, ASME/FED-Vol.81 (H00462), Pumping Machinery-1989,pp.167-172 (This is a step-by step analysis of a mixed flow impeller that includes a blade countouring procedure)
3. Salisbury,A.G.(1983), Current Concepts in Centrifugal Pump Hydraulic Design, Proc. IME, Vol.197A, pp.221-231 (This is a review of several methods including Stepanoff's specific speed approach and Anderson's area ratio method. It's got 6 appendices loaded with formulae)
4.Myles,D.J.(1969-70), An Analysis of Impeller and Volute Losses in Centrifugal Fans, Proc. IME, Vol. 184, Pt.1, No.14, pp.253-277 (While the title says fans nearly all of the contents apply to pumps. The discussions and author's reply adds 8 more pages of valuable information to the overall paper.)
For other valuable paper contributions to centrifugal pump technology look up the following names: H.H.Anderson, S. Yedidiah, A.Kovats, D.Florjancic, J.F.Peck and R.C.Worster.
              

I skipped Makay's reference which is; Machine Design, May 13, 1971, pp. 140-144

Three books that are reasonable:

1.    The Interaction between Geometry and Performance of a Centrifugal Pump, by B. Neumann MEP Limited, ISBN 0-85298-755-2

2.    Centrifugal Pumps Design and Application, Lobanoff and Ross, ISBN 0-87201-190-9

3.    Centrifugal Pup Design, John Tuzson, ISBN 0-471-36100-3

Edward M. Bennett
Manager of Turbomachinery Design, Impact Technologies, LLC.
ed.bennett@impact-tek.com

Though mine are more specific, I have much the same questions you do. You may want to try posting at
"Computational Fluid Dynamics - Online" i.e. ( http://
www.cfd-online.com ). This is a more erudite usenet than
this one ( not given to snide banter ). See also thread
"npsingh(mechanical)" Jul 25, 2002, in this forum for more
references. I 've seen "Centrifugal Pumps: Design and Application" by V.S. Lebanoff and R.R. Ross, and it is
worthwhile.
     Though heavily theoretical and rather dated by now, a
30 page paper detailing the overall concept is available freely online in PDF format at ( http;//naca.larc.nasa.gov
 /reports/1939/naca-tm-902.pdf ).
     Finally if you happen to know the publication, title,
or author of a particular paper, look for it in the search
engine of ( http;//searchpdf.adobe.com ). An invaluable resource of Adobe the licensor of PDF ( Portable Document
Format ) used mostly for scholarly papers. This is the central index of all PDF files on the net - about a million or so.

Two more internet sites of interest are:
http://www.turbocfd.meng.ucl.ac.uk/3dinv.html
http://sic.epfl.ch/SA/publications/SCR97/scr9-page24.html

P.S.
      delete (.pdf) from end of referenced paper
       it is otherwise readily accessible.

also look at
www.mcnallyinstitute.com
www.pumpuniversity.com
www.rampump.com  ;- handbook
the best way is to contact the pump vendors and let them design it for you

Keep the wheels on the ground
Bob
showshine@aol.com

a white paper at
( http://gltrs.grc.nasa.gov/reports/1996/tm-107262.pdf )
describes "BladeCAD" impeller design software. This and the newer "Blademaker" is available from ( www.modelspace.com ).
Also go to ( http://turbo10.com ) and enter "BladeCAD" in
this searchengine for more references.

Go to ( http://naca.larc.nasa.gov ) enter the following
citations in the searchengine, the top result is the paper.
naca-tn-1313, naca-tn-2421, naca-tn-2604, naca-tn-2654, and
naca-tn-2806.