Παραπομπή APA

Boslough, J. (1989). Stephen Hawking's universe. Avon Books.

Παραπομπή Chicago Style

Boslough, John. Stephen Hawking's Universe. Canada: Avon Books, 1989.

Παραπομπή MLA

Boslough, John. Stephen Hawking's Universe. Avon Books, 1989.