Ward, P. D. (2005). Life as we do not know it: The NASA search for (and synthesis of) alien life. Viking.
Citazione stile Chigago Style (17a edizione)Ward, Peter D. Life as We Do Not Know It: The NASA Search for (and Synthesis of) Alien Life. New York: Viking, 2005.
Citatione MLA (9a ed.)Ward, Peter D. Life as We Do Not Know It: The NASA Search for (and Synthesis of) Alien Life. Viking, 2005.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.