Παραπομπή APA

Laurent,Bertel. (1994). Introduction to spacetime (1st.). World Scientific.

Παραπομπή Chicago Style

Laurent,Bertel. Introduction to Spacetime. 1st. Singapore: World Scientific, 1994.

Παραπομπή MLA

Laurent,Bertel. Introduction to Spacetime. 1st. World Scientific, 1994.