Παραπομπή σε μορφή APA (7η εκδ.)

Rektorys, K. (1980). Variational methods in mathematics, science and engineering (2nd edition.). D. Reidel Publishing Company.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Rektorys, Karel. Variational Methods in Mathematics, Science and Engineering. 2nd edition. Dordrecht: D. Reidel Publishing Company, 1980.

Παραπομπή σε μορφή MLA (8th εκδ.)

Rektorys, Karel. Variational Methods in Mathematics, Science and Engineering. 2nd edition. D. Reidel Publishing Company, 1980.