APA Style

Ritchie, A., Haas, C. (2008). It's Time To Sleep, You Crazy Sheep ! = Waktunya Tidur, Domba Nakal ! . Jakarta: Erlangga for Kids.

MLA Style

Ritchie, Alison., Haas, Cornelia. "It's Time To Sleep, You Crazy Sheep ! = Waktunya Tidur, Domba Nakal !". Jakarta: Erlangga for Kids, 2008. Text.