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Terrence M. Joyce, "Tidal Forces", Observational Physical Oceanography, Course Notes 15, Fall 2002, http://www.whoi.edu/science/PO/people/tjoyce/WHOI-MIT_course/notes/course_notes15.htm

Bradley W. Carroll and Dale A. Ostlie, "An Introduction to Modern Astrophysics", Weber State University, 1996, pp. 666, 761-767

Alan P. Boss, "Is it just a coincidence that the moon's period of rotation and revolution are identical, so that we always see the same face? If not, how did this situation come to be?", Scientific American, Oct. 21 1999, http://www.sciam.com/askexpert_question.cfm?articleID=0000976C-7D8F-1C72-9EB7809EC588F2D7&catID=3