Παραπομπή APA

Grayling A C. (1997). An introduction to philosophical logic (3rd ed.). Blackwell.

Παραπομπή Chicago Style

Grayling A C. An Introduction to Philosophical Logic. 3rd ed. Oxford: Blackwell, 1997.

Παραπομπή MLA

Grayling A C. An Introduction to Philosophical Logic. 3rd ed. Blackwell, 1997.