APA (7th ed.) Citation

Koestler, A. (1969). Arrow in the blue ([1st American Danube ed.). Macmillan.

Chicago Style (17th ed.) Citation

Koestler, Arthur. Arrow in the Blue. [1st American Danube ed. New York]: Macmillan, 1969.

MLA (9th ed.) Citation

Koestler, Arthur. Arrow in the Blue. [1st American Danube ed. Macmillan, 1969.