Cita APA (7a ed.)

Gardner, E. S. (1957). The case of the drowning duck. Penguin.

Cita Chicago Style (17a ed.)

Gardner, Erle Stanley. The Case of the Drowning Duck. Penguin, 1957.

Cita MLA (8a ed.)

Gardner, Erle Stanley. The Case of the Drowning Duck. Penguin, 1957.