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.
Atenció: Aquestes cites poden no estar 100% correctes.