Παραπομπή APA

Harwit, M. (1973). Astrophysical concepts. Wiley Eastern.

Παραπομπή Chicago Style

Harwit, Martin. Astrophysical Concepts. New York: Wiley Eastern, 1973.

Παραπομπή MLA

Harwit, Martin. Astrophysical Concepts. Wiley Eastern, 1973.