APA

Bentley S., Swan A., . (2006). Double Trouble. London: Puffin.

Chicago

Bentley Sue, Swan Angela, . 2006. Double Trouble. London: Puffin.

Harvard

Bentley S., Swan A., . (2006). Double Trouble. London: Puffin.

MLA

Bentley Sue, Swan Angela, . Double Trouble. London: Puffin. 2006.