Cassels, J. (1960). How to sell successfully by direct mail. Business publications.
استشهاد بنمط شيكاغوCassels, J.W.W. How to Sell Successfully by Direct Mail. London: Business publications, 1960.
MLA استشهادCassels, J.W.W. How to Sell Successfully by Direct Mail. Business publications, 1960.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.