Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

ebrary, Inc, et al. Encountering Life in the Universe: Ethical Foundations and Social Implications of Astrobiology. University of Arizona Press, 2013.