APA-viite (7. p.)

Barcalow, E. (2001). Open questions: An introduction to philosophy (3rd ed.). Wadsworth/Thomson Learning.

Chicago-viite (17. p.)

Barcalow, Emmett. Open Questions: An Introduction to Philosophy. 3rd ed. Australia: Wadsworth/Thomson Learning, 2001.

MLA-viite (9. p.)

Barcalow, Emmett. Open Questions: An Introduction to Philosophy. 3rd ed. Wadsworth/Thomson Learning, 2001.