@book {Ellis-1939-SBG,
	address=	"New York, NY",
	author=		"Willis D. Ellis",
	publisher=	"Harcourt, Brace, and company",
	title=		"A source book of gestalt psychology",
	year=		"1939",
	theme=		"perception",
	project=	"art and genetic",
	added-by=	"Daniel Acevedo",
	date-added=	"Tue March 2 15:59:31 2004"
}
@book {Ellis-1939-SBG-url,
	address=	"New York, NY",
	author=		"Willis D. Ellis",
	note=		" \url{http://vis.cs.brown.edu/results/bibtex/Ellis-1939-SBG.bib}{(bibtex: Ellis-1939-SBG)}",
	publisher=	"Harcourt, Brace, and company",
	title=		"A source book of gestalt psychology",
	year=		"1939",
	theme=		"perception",
	project=	"art and genetic",
	added-by=	"Daniel Acevedo",
	date-added=	"Tue March 2 15:59:31 2004"
}