APA (7e ed.) Bronvermelding

Terzian, Y., & Bilson, E. (1997). Carl Sagan's universe. Cambridge University Press.

Chicago (17e ed.) Bronvermelding

Terzian, Yervant, en Elizabeth Bilson. Carl Sagan's Universe. Cambridge: Cambridge University Press, 1997.

MLA (9e ed.) Bronvermelding

Terzian, Yervant, en Elizabeth Bilson. Carl Sagan's Universe. Cambridge University Press, 1997.