APA (7e ed.) Bronvermelding

Sagan. Cosmic Apprentice. University of Minnesota Press.

Chicago (17e ed.) Bronvermelding

Sagan. Cosmic Apprentice. University of Minnesota Press.

MLA (8e ed.) Bronvermelding

Sagan. Cosmic Apprentice. University of Minnesota Press.

Let op: Deze citaties zijn niet altijd 100% accuraat.