Cita APA (7a ed.)

Brebbia, C., & Tottenham, H. (1973). Variational methods in engineering. Vol: I. Univesity Press Of America.

Cita Chicago Style (17a ed.)

Brebbia, C.A, y H. Tottenham. Variational Methods in Engineering. Vol: I. Southampton: Univesity Press Of America, 1973.

Cita MLA (9a ed.)

Brebbia, C.A, y H. Tottenham. Variational Methods in Engineering. Vol: I. Univesity Press Of America, 1973.