Dona, probably would recommend 2 books that are about the best general reference books on milk glass but then after that you have to go by maker, as there are reference books for just Imperial milk glass, or Westmoreland milk glass etc.
The Milk Glass Book ( Schiffer) by Frank Chiarenza and James Slater is an excellent one but probably more rare pieces that the average household would not have had.
It was done in about 1998. Frank use to be the President of the National Milk Glass Collectors Society and had a glass museum back east at one time.
The other, a more general one but good for basic milk glass and the first one I bought is,
Collector's Encyclopedia of Milk Glass by Betty and Bill Newbound. Libraries might have this one, I kept checking it out till I bought one when I first collected.
But neither will have updated to 2009 prices probably but will give you a general idea of price based at publishing time.
NOTE: if anyone has photos of milk glass they want identified or want more information of, just email me and I would be glad to do it for you.