i have found this problem myself. with modern computer software, it is rare to find references. however, i have one absolutely excellent example:
"Bridge Design for the Civil and Structural Professional Engineering
Exams" by Robert H. Kim, MSCE, PE and Jai B. Kim, Phd, PE
I am not sure where you can get a copy. i ordered my copy through local inter-library loan. go to the library of congress to find out more info on the book.