Cita APA (7th ed.)
Ludvigsen, M. (1999). General relativity: A geometric approach. Cambridge University Press.
Cita Chicago (17th ed.)
Ludvigsen, Malcolm. General Relativity: A Geometric Approach. Cambridge ; New York: Cambridge University Press, 1999.
Cita MLA (9th ed.)
Ludvigsen, Malcolm. General Relativity: A Geometric Approach. Cambridge University Press, 1999.
Atenció: Aquestes cites poden no estar 100% correctes.