APA

STEVENS C., . (2004). whos knocking at the door. new york: marshall cavendish.

Chicago

STEVENS CARLA, . 2004. whos knocking at the door. new york: marshall cavendish.

Harvard

STEVENS C., . (2004). whos knocking at the door. new york: marshall cavendish.

MLA

STEVENS CARLA, . whos knocking at the door. new york: marshall cavendish. 2004.