Frank, William W.
How to outsell : the born salesman / by William W. Frank and Charless L. Lapp
Macmillan, 1959
Buku Teks SO
Lapp, Charles L.
Successful selling strategies : how to climb the ladder to sales succes / Charles L. Lapp
McGraw-Hill, 1957
Buku Teks SO
Pool, John Charles
The instant economist / John Charles Pool and Ross M. LaRoe.
Massachussetts cAddsion-Wesley 21 cm., 1985
Buku Teks
Luyben, Michael L.
Essentials of process control / Michael L. Luyben, William L. Luyben
McGraw-Hill, 1987
Buku Teks SO
Alexander, Ralph S.
Industrial marketing / by Ralph S. Alexander, James S. Cross, Ross M. Cunningham
Richard D. Irwin, 1956
Buku Teks SO