Παραπομπή APA

Ryder, L. H. (2009). Introduction to general relativity. Cambridge University Press.

Παραπομπή Chicago Style

Ryder, Lewis H. Introduction to General Relativity. Cambridge, UK ; New York: Cambridge University Press, 2009.

Παραπομπή MLA

Ryder, Lewis H. Introduction to General Relativity. Cambridge University Press, 2009.