APA

Prowse P., . (1999). Help!. [y.y.]: Cambridge University Press.

Chicago

Prowse Philip, . 1999. Help!. [y.y.]: Cambridge University Press.

Harvard

Prowse P., . (1999). Help!. [y.y.]: Cambridge University Press.

MLA

Prowse Philip, . Help!. [y.y.]: Cambridge University Press. 1999.