various. (1991). QUESTIONS KIDS ASK ABOUT SNAKES AND FROGS VOL 17 (Unknown.). Grollier Limited.
Citazione stile Chigago Style (17a edizione)various. QUESTIONS KIDS ASK ABOUT SNAKES AND FROGS VOL 17. Unknown. Grollier Limited, 1991.
Citatione MLA (9a ed.)various. QUESTIONS KIDS ASK ABOUT SNAKES AND FROGS VOL 17. Unknown. Grollier Limited, 1991.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.