APA
Na, . (2003). Peppa Pig: Happy Birthday, Peppa. United Kingdom: Ladybird Books Ltd.
Chicago
Na, . 2003. Peppa Pig: Happy Birthday, Peppa. United Kingdom: Ladybird Books Ltd.
Harvard
Na, . (2003). Peppa Pig: Happy Birthday, Peppa. United Kingdom: Ladybird Books Ltd.
MLA
Na, . Peppa Pig: Happy Birthday, Peppa. United Kingdom: Ladybird Books Ltd. 2003.