APA

Buchan J., . (1993). Thirty-Nine Steps. England: Penguin Books.

Chicago

Buchan John, . 1993. Thirty-Nine Steps. England: Penguin Books.

Harvard

Buchan J., . (1993). Thirty-Nine Steps. England: Penguin Books.

MLA

Buchan John, . Thirty-Nine Steps. England: Penguin Books. 1993.