@book{166876,
	author = {Anderson, Leon},
	title = {Analyzing social settings  a guide to qualitative observation and analysis},
	publisher = {Wadsworth/Thomson Learning},
	year = {2006},
	address = {Belmont (California, Estados Unidos)},
	edition = {4th ed},
	url = {http://www.loc.gov/catdir/enhancements/fy1212/2005927914-t.html}
}