Παραπομπή APA

Gribbin, J. R. (1999). Companion to the cosmos. Universities Press.

Παραπομπή Chicago Style

Gribbin, John R. Companion to the Cosmos. Hyderabad: Universities Press, 1999.

Παραπομπή MLA

Gribbin, John R. Companion to the Cosmos. Universities Press, 1999.