Berger, M., & Male, A. (2001). Can Snakes Crawl Backward: Questions and Answers About Reptiles. Scholastic Reference.
Citazione stile Chigago Style (17a edizione)Berger, Melvin, e Alan Male. Can Snakes Crawl Backward: Questions and Answers About Reptiles. New York: Scholastic Reference, 2001.
Citatione MLA (9a ed.)Berger, Melvin, e Alan Male. Can Snakes Crawl Backward: Questions and Answers About Reptiles. Scholastic Reference, 2001.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.