Astley, N. &. B. (2003). Happy Birthday Peppa! Ladybird Books.
Chicagoスタイル(17版)引用形式Astley, Neville & Baker. Happy Birthday Peppa! london: Ladybird Books, 2003.
MLA(8版)引用形式Astley, Neville & Baker. Happy Birthday Peppa! Ladybird Books, 2003.
警告: この引用は必ずしも正確ではありません.