APA (7th ed.) Citation

Buchan, J. (1996). The thirty-nine steps by John Buchan. Project Gutenberg Literary Archive Foundation.

Chicago Style (17th ed.) Citation

Buchan, John. The Thirty-nine Steps by John Buchan. Salt Lake City: Project Gutenberg Literary Archive Foundation, 1996.

MLA (9th ed.) Citation

Buchan, John. The Thirty-nine Steps by John Buchan. Project Gutenberg Literary Archive Foundation, 1996.

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