1993 - 500 Hilarious Knockknock Jokes for Kids (Paperback) ISBN-13: 9780345381606 ISBN-10: 0345381602 Genres: Children's Books, Humor & Entertainment 1 1992 - 500 Wacky Knockknock Jokes (Paperback) ISBN-13: 9780345380807 ISBN-10: 0345380800 Genres: Children's Books, Humor & Entertainment 2 |