Marzollo, Jean. I spy : a penguin / riddles by Jean Marzollo ; photographs by Walter Wick. - New York : Scholastic, c2005. - 1 v. (unpaged) : col. ill. ; 23 cm. - Scholastic reader. Level 1 . "Cartwheel Books." ISBN: 0439738628 (pbk.) LCCN: 2005005657 Subjects--Topical Terms: Picture puzzles--Juvenile literature. LC Class. No.: GV1507.P47 / M284 2005 Dewey Class. No.: 793.73