Cita APA (7th ed.)

Arthurs, A. M. (1970). Complementary variational principles. Clarendon Press.

Cita Chicago (17th ed.)

Arthurs, A. M. Complementary Variational Principles. Oxford: Clarendon Press, 1970.

Cita MLA (9th ed.)

Arthurs, A. M. Complementary Variational Principles. Clarendon Press, 1970.