Cita APA (7a ed.)

Buchan, J. (1994). The Thirty-Nine Steps. Penguin Books.

Cita Chicago Style (17a ed.)

Buchan, John. The Thirty-Nine Steps. London: Penguin Books, 1994.

Cita MLA (9a ed.)

Buchan, John. The Thirty-Nine Steps. Penguin Books, 1994.