Dunckel,Earl.B, & Reed, W. W. (1970). Business Environment of Seventees: A Trend Analysis For Business Planning. McGraw-Hill.
Dyfyniad Arddull ChicagoDunckel,Earl.B, and William.K Wilson Reed. Business Environment of Seventees: A Trend Analysis For Business Planning. New York: McGraw-Hill, 1970.
Dyfyniad MLADunckel,Earl.B, and William.K Wilson Reed. Business Environment of Seventees: A Trend Analysis For Business Planning. McGraw-Hill, 1970.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.