Παραπομπή APA

Kutmer, M. L. (1987). Astronomy: A physical perspective. Harper & Row.

Παραπομπή Chicago Style

Kutmer, Marc L. Astronomy: A Physical Perspective. New York: Harper & Row, 1987.

Παραπομπή MLA

Kutmer, Marc L. Astronomy: A Physical Perspective. Harper & Row, 1987.