APA-Zitierstil (7. Ausg.)

Bradley, R., & Swartz, N. (1979). Possible worlds: An introduction to logic and its philosophy (1. publ. in the United Kingdom.). Blackwell.

Chicago-Zitierstil (17. Ausg.)

Bradley, Raymond, und Norman Swartz. Possible Worlds: An Introduction to Logic and Its Philosophy. 1. publ. in the United Kingdom. Oxford: Blackwell, 1979.

MLA-Zitierstil (9. Ausg.)

Bradley, Raymond, und Norman Swartz. Possible Worlds: An Introduction to Logic and Its Philosophy. 1. publ. in the United Kingdom. Blackwell, 1979.