Παραπομπή APA

Novikov, I. D. (1990). Black holes and the universe. Cambridge University Press.

Παραπομπή Chicago Style

Novikov, I. D. Black Holes and the Universe. Cambridge [England]: Cambridge University Press, 1990.

Παραπομπή MLA

Novikov, I. D. Black Holes and the Universe. Cambridge University Press, 1990.