Παραπομπή σε μορφή APA (7η εκδ.)

Wald, R. M. (1992). Space, Time, and Gravity: The Theory of the Big Bang and Black Holes (2nd ed.). The University of Chicago Press.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Wald, Robert M. Space, Time, and Gravity: The Theory of the Big Bang and Black Holes. 2nd ed. Chicago: The University of Chicago Press, 1992.

Παραπομπή σε μορφή MLA (9th εκδ.)

Wald, Robert M. Space, Time, and Gravity: The Theory of the Big Bang and Black Holes. 2nd ed. The University of Chicago Press, 1992.