Product picture - Cengage Course Tech. Book: David Busch's Panasonic Lumix DMC-GF1 Guide to Digital Photography by David D. Busch, Dan Simon Cengage, Course, Tech., Book:, David, Busch's, Panasonic, Lumix, DMC-GF1, Guide, to, Digital, Photography, by, David, D., Busch, Dan, Simon Click the image to close this page