Cita APA (7th ed.)

Ehlers, J. (1993). Canonical gravity: From classical to quantum. Springer-Verlag.

Cita Chicago (17th ed.)

Ehlers, J. Canonical Gravity: From Classical to Quantum. New York: Springer-Verlag, 1993.

Cita MLA (9th ed.)

Ehlers, J. Canonical Gravity: From Classical to Quantum. Springer-Verlag, 1993.