Reddit reviews Ageplay: From Diapers to Diplomas

Fetlife is always a good resource for anything kink related.

Subreddits:
r/ageplay
r/littlespace

Here is a book:
http://www.amazon.com/gp/aw/d/1610981901

And you can always ask questions of friendly reditors.

Just remember ageplay spans a lot and there really isn't a play book for how. It can be bathing and brushing her hair, or just some choice words during sex, to anything you can imagine.

There is some good history in Paul Rulof's, Ageplay: From Diapers to Diplomas. He pretty much traces Abdl with the rise of what we consider to be "childhood". Back in the day, without child labor laws, children weren't really treated that differently than adults. With the start of child labor laws, mandatory public education, things designed specifically for children etc.. childhood became its own sacred time in a persons life, free from all the stresses of adulthood. :)

Ageplay: From Diapers to Diplomas

Written by a friend of a friend.

http://www.amazon.com/Age-Play-Diaper-Fetish-Handbook/dp/1257061046

also:
http://www.amazon.com/Theres-baby-bed-Learning-relationship/dp/1610983068/
http://www.amazon.com/Ageplay-Diapers-Diplomas-Paul-Rulof/dp/1610981901/