Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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