@book{24405,
	author = {Ptolemy; Copernicus; Kepler and Hutchins, Robert Maynard, Editor in Chief},
	title = {Ptolemy, Copernicus, Kepler},
	publisher = {Encyclopedia Britanica},
	year = {1952},
	address = {Lake Region, HS},
	note = {D., 10/01}
}