APA (7th ed.) Citation

Koestler, A. (1969). The invisible writing ([1st American Danube ed.). Macmillan.

Chicago Style (17th ed.) Citation

Koestler, Arthur. The Invisible Writing. [1st American Danube ed. New York]: Macmillan, 1969.

MLA (9th ed.) Citation

Koestler, Arthur. The Invisible Writing. [1st American Danube ed. Macmillan, 1969.