Dunckel, E. B. (1970). The business environment of the seventies: A trend analysis for business planning. New York: McGraw- Hill.
استشهاد بنمط شيكاغوDunckel, Earl B. The Business Environment of the Seventies: A Trend Analysis for Business Planning. New York: McGraw- Hill, 1970.
MLA استشهادDunckel, Earl B. The Business Environment of the Seventies: A Trend Analysis for Business Planning. New York: McGraw- Hill, 1970.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.