Παραπομπή APA

Ludvigsen, M. (1999). General relativity: A geometric approach. Cambridge University Press.

Παραπομπή Chicago Style

Ludvigsen, Malcolm. General Relativity: A Geometric Approach. Cambridge ; New York: Cambridge University Press, 1999.

Παραπομπή MLA

Ludvigsen, Malcolm. General Relativity: A Geometric Approach. Cambridge University Press, 1999.