Buckley, E. A. (1961). How to increase sales with letters. McGraw Hill book company.
Chicago-стиль цитированияBuckley, Earle A. How to Increase Sales with Letters. New York: McGraw Hill book company, 1961.
MLA-цитированиеBuckley, Earle A. How to Increase Sales with Letters. McGraw Hill book company, 1961.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.