Cita APA (7th ed.)

Astley, N. &. B. (2003). Happy Birthday Peppa! Ladybird Books.

Cita Chicago (17th ed.)

Astley, Neville & Baker. Happy Birthday Peppa! london: Ladybird Books, 2003.

Cita MLA (8th ed.)

Astley, Neville & Baker. Happy Birthday Peppa! Ladybird Books, 2003.