Condition: Very Good Secondhand Condition, Minor Wear If Any. Get ready to have a blast with this hilarious book of Knock-Knock Jokes for Kids, written by Rob Elliot. This book is perfect for children between the ages of 2-12 who enjoy humor and laughter. With over 100 pages of pure fun, this book will keep your child entertained for hours. The book is published by Revell and is available in Mass Market format. It is written in English and is suitable for all audiences, including those under 2 years old. The book falls under the categories of Books & Magazines and is ideal for any child who loves jokes and riddles.