APA aipamena

Buchan, J. The thirty nine steps. London: Longman Green.

Chicago Style aipamena

Buchan, John. The Thirty Nine Steps. London: Longman Green.

MLA aipamena

Buchan, John. The Thirty Nine Steps. London: Longman Green.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.