Cita APA (7th ed.)

Gott, J. R., & Vanderbei, R. J. (2011). Sizing up the universe: The cosmos in perspective. National Geographic.

Cita Chicago (17th ed.)

Gott, J. Richard., i Robert J. Vanderbei. Sizing Up the Universe: The Cosmos in Perspective. Washington, D.C: National Geographic, 2011.

Cita MLA (9th ed.)

Gott, J. Richard., i Robert J. Vanderbei. Sizing Up the Universe: The Cosmos in Perspective. National Geographic, 2011.