Cita APA (7th ed.)
Ortín, T. (2004). Gravity and strings. Cambridge University Press.
Cita Chicago (17th ed.)
Ortín, Tomás. Gravity and Strings. Cambridge: Cambridge University Press, 2004.
Cita MLA (9th ed.)
Ortín, Tomás. Gravity and Strings. Cambridge University Press, 2004.
Atenció: Aquestes cites poden no estar 100% correctes.