various. (1991). QUESTIONS KIDS ASK ABOUT SNAKES AND FROGS VOL 17 (Unknown.). Grollier Limited.
Čikaški stil citiranja (17. izdanje)various. QUESTIONS KIDS ASK ABOUT SNAKES AND FROGS VOL 17. Unknown. Grollier Limited, 1991.
MLA način citiranja (9. izdanje)various. QUESTIONS KIDS ASK ABOUT SNAKES AND FROGS VOL 17. Unknown. Grollier Limited, 1991.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.