Cita APA (7a ed.)

Sears, W. R. (1960). Small Perturbation Theory. Princeton University Press.

Cita Chicago Style (17a ed.)

Sears, William Rees. Small Perturbation Theory. Princeton, N.J.: Princeton University Press, 1960.

Cita MLA (8a ed.)

Sears, William Rees. Small Perturbation Theory. Princeton University Press, 1960.