Cita APA (7a ed.)

Poundstone, W. (1999). Carl Sagan: A life in the cosmos. Henry Holt and Co.

Cita Chicago Style (17a ed.)

Poundstone, William. Carl Sagan: A Life in the Cosmos. New York: Henry Holt and Co, 1999.

Cita MLA (9a ed.)

Poundstone, William. Carl Sagan: A Life in the Cosmos. Henry Holt and Co, 1999.