The comet book :
a guide for the return of Halley's Comet /
Robert D. Chapman & John C. Brandt.
APA Citation
Chapman, R. DeWitt., Brandt, J. C. (1984). The comet book: a guide for the return of Halley's Comet. Boston: Jones and Bartlett Publishers.
MLA Citation
Chapman, Robert DeWitt, 1937-, and John C Brandt. The Comet Book: a Guide for the Return of Halley's Comet. Boston: Jones and Bartlett Publishers, 1984.
Warning: These citations may not always be complete (especially for serials).