APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Bradley, Raymond S., and Norman Swartz. Possible Worlds: An Introduction to Logic and Its Philosophy. Oxford: B. Blackwell, 1979.

MLA (8th ed.) Citation

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

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