A manual on bookselling /​ edited by Charles B. Anderson, Joseph A. Duffy and Jocelyn D. Kahn.
American Booksellers Association, 1969
 Buku Teks
Duffy, Dean G.
Solutions of partial / Dean G. Duffy
TAB prefessional and reference books, 1986
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Duffy, Ben
Advertising media and markets / by Ben Duffy
Prentice-Hall, 1957
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Pople, Maureen
The other side of the family / Maureen pople
St.Lucia:University of Queenssland, 1986
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Africa speaks / edited by James Duffy and Robert A. Manners
D. Van Nostrand Company, 1961
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