Cita APA (7a ed.)

Rektorys, K. (1980). Variational methods in mathematics, science and engineering (2a ed.). Reidel Publishing Company.

Cita Chicago Style (17a ed.)

Rektorys, Karel. Variational Methods in Mathematics, Science and Engineering. 2a ed. Dordreht: Reidel Publishing Company, 1980.

Cita MLA (9a ed.)

Rektorys, Karel. Variational Methods in Mathematics, Science and Engineering. 2a ed. Reidel Publishing Company, 1980.