Style de citation APA (7e éd.)

Rektorys, K. (1980). Variational methods in mathematics, science, and engineering (2nd ed.). D. Reidel Pub. Co..

Style de citation Chicago (17e éd.)

Rektorys, Karel. Variational Methods in Mathematics, Science, and Engineering. 2nd ed. Dordrecht, Holland ; Boston, U.S.A.: D. Reidel Pub. Co., 1980.

Style de citation MLA (8e éd.)

Rektorys, Karel. Variational Methods in Mathematics, Science, and Engineering. 2nd ed. D. Reidel Pub. Co., 1980.