APA (7th ed.) Citation

Öpik, E. J. (1976). Interplanetary encounters: Close-range gravitational interactions. Elsevier Scientific Pub. Co..

Chicago Style (17th ed.) Citation

Öpik, Ernst Julius. Interplanetary Encounters: Close-range Gravitational Interactions. Amsterdam ; New York: Elsevier Scientific Pub. Co., 1976.

MLA (9th ed.) Citation

Öpik, Ernst Julius. Interplanetary Encounters: Close-range Gravitational Interactions. Elsevier Scientific Pub. Co., 1976.