Cita APA

Abell, G. O. 1., & Abell, G. O. 1. (1969). Exploration of the universe (2. edition.). New York, New York: Holt, Rinehart and Winston.

Citación estilo Chicago

Abell, George Ogden 1927-1983, y George Ogden 1927-1983 Abell. Exploration of the Universe. 2. edition. New York, New York: Holt, Rinehart and Winston, 1969.

Cita MLA

Abell, George Ogden 1927-1983, y George Ogden 1927-1983 Abell. Exploration of the Universe. 2. edition. New York, New York: Holt, Rinehart and Winston, 1969.