APA استشهاد

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

استشهاد بنمط شيكاغو

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

MLA استشهاد

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