Sagan, C. (2011). Pale blue dot: A vision of the human future in space.
Cita Chicago Style (17a ed.)Sagan, Carl. Pale Blue Dot: A Vision of the Human Future in Space. 2011.
Cita MLA (8a ed.)Sagan, Carl. Pale Blue Dot: A Vision of the Human Future in Space. 2011.
Precaución: Estas citas no son 100% exactas.