Sarah Courtauld. (2019). "Frogs (First Reading Level 3) [Paperback] [Jan 01, 2010] NILL". Usborne.
Chicagoスタイル(17版)引用形式Sarah Courtauld. "Frogs (First Reading Level 3) [Paperback] [Jan 01, 2010] NILL". Usborne, 2019.
MLA(9版)引用形式Sarah Courtauld. "Frogs (First Reading Level 3) [Paperback] [Jan 01, 2010] NILL". Usborne, 2019.
警告: この引用は必ずしも正確ではありません.