APA (7th ed.) Citation

Buchan, J. (1993). The thirty nine steps. Penguin Books.

Chicago Style (17th ed.) Citation

Buchan, John. The Thirty Nine Steps. London: Penguin Books, 1993.

MLA (9th ed.) Citation

Buchan, John. The Thirty Nine Steps. Penguin Books, 1993.

Warning: These citations may not always be 100% accurate.