Lewis, R. (1992). Life: Beginnings of life, animal life, plant life, evolution of life, behavior and ecology of life. Wm. C. Brown.
Cita Chicago (17th ed.)Lewis, Ricki. Life: Beginnings of Life, Animal Life, Plant Life, Evolution of Life, Behavior and Ecology of Life. Dubuque, IA: Wm. C. Brown, 1992.
Cita MLA (9th ed.)Lewis, Ricki. Life: Beginnings of Life, Animal Life, Plant Life, Evolution of Life, Behavior and Ecology of Life. Wm. C. Brown, 1992.
Atenció: Aquestes cites poden no estar 100% correctes.