Cita APA

Schaaf, F. (1997). Comet of the century: From Halley to Hale-Bopp.

Chicago Edition Citation

Schaaf, Fred. Comet of the Century: From Halley to Hale-Bopp. New York, Springer-Verlag, 1997.

Cita MLA

Schaaf, Fred. Comet of the Century: From Halley to Hale-Bopp. 1997.