Παραπομπή APA

Kovalevsky, J. (1967). Introduction to celestial mechanics. D. Reidel.

Παραπομπή Chicago Style

Kovalevsky, Jean. Introduction to Celestial Mechanics. Dordrecht: D. Reidel, 1967.

Παραπομπή MLA

Kovalevsky, Jean. Introduction to Celestial Mechanics. D. Reidel, 1967.