@book{142968,
	author = {National Project in Agricultural Communications. and Ball, John and National Project in Agricultural Communications.},
	title = {Research, principles, and practices in visual communication},
	year = {c1960.},
	address = {Michigan : [s.n.]},
	note = {"Originally published as a part of the Communications Training Program developed by the National Project in Agricultural Communications for the American Association of Land-Grant Colleges and State Universities."}
}