This article is from the Magic FAQ, by Paul Nielsen firstname.lastname@example.org with numerous contributions by others.
Easley, Bert Doing Magic for Youngsters
(1972, D. Robbins)
[RD] From the style, I think this was written much earlier than 1972.
Even so, it contains a wealth of advice that is valid today.
Ginn, David Children Laugh Louder
(1978, Scarlett Green)
[RD] Basically a collection of routines and gags that Mr. Ginn has
used (in 300 shows per year) and found to be amusing for school-age
children. Some very useful ideas. I've used his "Silk Illusion"
opener with good results.
Ginn, David Professional Magic for Children
(1976, Scarlett Green)
[RD] Lots of intelligent advice from an expert. Tells you how to
construct a show for children, including proper sequencing of effects.
Also includes several routines to illustrate the points. Get this one
before you get Children Laugh Louder.