APA (7th ed.) Citation

Bradley, R., & Swartz, N. (1979). Possible worlds: An introduction to logic and its philosophy. Hackett.

Chicago Style (17th ed.) Citation

Bradley, Raymond, and Norman Swartz. Possible Worlds: An Introduction to Logic and Its Philosophy. Indianapolis u.a: Hackett, 1979.

MLA (9th ed.) Citation

Bradley, Raymond, and Norman Swartz. Possible Worlds: An Introduction to Logic and Its Philosophy. Hackett, 1979.

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