Gaya APA

Books, L., Johnson, R. (2013). The ugly duckling : Read it yourself with Ladybird level 1 (Jil. 1). London: Ladybird Books Ltd.

Gaya MLA

Books, Ladybird., Johnson, Richard. "The ugly duckling : Read it yourself with Ladybird level 1". Jil. 1 London: Ladybird Books Ltd, 2013. Text.