Trump, Ross M.
Essentials of marketing management / Ross M. Trump, Martin L. Bell, William Emory, Charles Leon Lapp, and others
Houghton Mifflin , 1966
 Buku Teks
Frank, William W.
How to outsell : the born salesman / by William W. Frank and Charless L. Lapp
Macmillan, 1959
 Buku Teks
Lapp, Charles L.
Successful selling strategies : how to climb the ladder to sales succes / Charles L. Lapp
McGraw-Hill, 1957
 Buku Teks
Pool, John Charles
The instant economist / John Charles Pool and Ross M. LaRoe.
Massachussetts cAddsion-Wesley 21 cm., 1985
 Buku Teks
Bell, Charles G.
California Government Today: Politics of reform/ Charles G. Bell, Charles M. Price
The Dorsey Press, 1980
 Buku Teks
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