Buckley, E. A. (1961). How to increase sales with letters. McGraw Hill.
Chicago Edition CitationBuckley, Earle A. How to Increase Sales with Letters. McGraw Hill, 1961.
Cita MLABuckley, Earle A. How to Increase Sales with Letters. McGraw Hill, 1961.
Atenció: Aquestes cites poden no estar 100% correctes.