APA (7th ed.) Citation

Koestler, A. (1970). The act of creation / by A. Koestler (Danube ed.). Pan Books.

Chicago Style (17th ed.) Citation

Koestler, Arthur. The Act of Creation / by A. Koestler. Danube ed. Pan Books, 1970.

MLA (9th ed.) Citation

Koestler, Arthur. The Act of Creation / by A. Koestler. Danube ed. Pan Books, 1970.

Warning: These citations may not always be 100% accurate.