Cita APA (7th ed.)
Hakin, R. An Introduction to Relativistic Gravitation. Cambridge University.
Cita Chicago (17th ed.)
Hakin, Rémi. An Introduction to Relativistic Gravitation. Cambridge, Inglaterra: Cambridge University.
Cita MLA (9th ed.)
Hakin, Rémi. An Introduction to Relativistic Gravitation. Cambridge University.
Atenció: Aquestes cites poden no estar 100% correctes.