APA-viite

HAWKING,STEPHEN. (1993). BLACK HOLES AND BABY UNIVERSES AND OTHER ESSAYS. Bantam Books.

Chicago-tyylinen lähdeviittaus

HAWKING,STEPHEN. BLACK HOLES AND BABY UNIVERSES AND OTHER ESSAYS. TORONTO: Bantam Books, 1993.

MLA-viite

HAWKING,STEPHEN. BLACK HOLES AND BABY UNIVERSES AND OTHER ESSAYS. Bantam Books, 1993.