Παραπομπή σε μορφή APA (7η εκδ.)

Lavrentʹev, M. A., & Radok, J. R. M. (1989). Variational methods for boundary value problems for systems of elliptic equations. Dover Publications.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Lavrentʹev, M. A., και J. R. M. Radok. Variational Methods for Boundary Value Problems for Systems of Elliptic Equations. New York: Dover Publications, 1989.

Παραπομπή σε μορφή MLA (8th εκδ.)

Lavrentʹev, M. A., και J. R. M. Radok. Variational Methods for Boundary Value Problems for Systems of Elliptic Equations. Dover Publications, 1989.