@book{19720,
	author = {Wilkerson, M. Scott , Wilkerson, M. Beth & Marshak, Stephhen},
	title = {Geotours Workbook: A Guide for Exploring & Creating Projects using Google Earth},
	publisher = {W.W. Norton & Company},
	year = {2012},
	address = {New York},
	note = {includes credits & appendix}
}