APA (7th ed.) Citation

Wahlöö, P. (1967). The thirty-first floor (1st American ed.). Knopf.

Chicago Style (17th ed.) Citation

Wahlöö, Per. The Thirty-first Floor. 1st American ed. New York: Knopf, 1967.

MLA (9th ed.) Citation

Wahlöö, Per. The Thirty-first Floor. 1st American ed. Knopf, 1967.