Franklin

MLA

Impey, Chris, Anna H Spitz, and William R Stoeger. Encountering Life In the Universe: Ethical Foundations and Social Implications of Astrobiology. Tucson: University of Arizona Press, 2013.

APA

Impey, C., Spitz, A. H., & Stoeger, W. R. (2013). Encountering life in the universe: ethical foundations and social implications of astrobiology. Tucson: University of Arizona Press.

Chicago

Impey, Chris., Anna H. Spitz, and William R Stoeger. Encountering Life In the Universe: Ethical Foundations and Social Implications of Astrobiology. Tucson: University of Arizona Press, 2013.