One Potato, Two Potato
The Folklore of American Children
by Herbert Knapp & Mary Knapp
W W Norton & Co; ISBN: 0393090396

Co-authored by the illustrator of Auditioning for the Musical Theatre, this is a fascinating and often extremely humorous in-depth study of the way children's traditional games, rhymes, and customs help them grow up. What did you say when somebody's underwear showed? In print since 1976, an American classic.