Cita APA (7a ed.)

Upgren, A. R. (2005). Many skies: Alternative histories of the sun, moon, planets, and stars. Rutgers University Press.

Cita Chicago Style (17a ed.)

Upgren, Arthur R. Many Skies: Alternative Histories of the Sun, Moon, Planets, and Stars. Piscataway: Rutgers University Press, 2005.

Cita MLA (8a ed.)

Upgren, Arthur R. Many Skies: Alternative Histories of the Sun, Moon, Planets, and Stars. Rutgers University Press, 2005.