I've found modelling a human through the help of a book quite a struggle when i first started... it lacked explanation, for example why use this tool on this feature... doesn't really explain alot. I would recommend video tutorial as its far simplier and easier to follow.
1/Gnomon Workshop Series - Humaniod Modelling, Head Modelling (don't get the Organic one first - thats patch modelling and does get quite complicated)
2/Simply Maya video training by Kurt is just as good, particularly the Ninja Warrior as its focuses more on the human appearance.
The only difference is that the Gnomon ones will hold your hand from start to finish, where as the simply maya one will start you off and give you some space to work on your own - to catch up and to perfect it before continuing.
If your still insistent on books, then Learning Maya Series is useful, they have a Modelling book which explains poly and nurbs modelling of a human body. (both female and male forms covered)
3D Modeler and Texture Painter (Learning)
"We have limits.... our imagination does not"
Final Year: University of Bradford (Worst place to live and study in the UK!!)