ISBN-13: 9780970909244 / Angielski / Miękka / 2010 / 48 str.
First published in 1976, What Is A Girl? What Is A Boy? was hailed in the New York Times Book Review as "a simple, straightforward, cut-through-the-garbage explanation of what does--and doesn't--make a boy or a girl...The photographs set the record straight with humor, intelligence and earthy candor." The target audience is ages 3-7.