Snow is only one of several phenomenas that causes icing. Others include freezing rain and drizzle, frost, and supercooled large droblets, Snow may or may not cause icing depending on the temperature.
As far as books on subject any aviation weather (meteriology) book for pilots covers the subject, but the one I find the best is "Aircraft Icing A Pilots Guide" by Terry T. Lankford (2000)