Lapp, Charles L.
Successful selling strategies : how to climb the ladder to sales succes / Charles L. Lapp
McGraw-Hill, 1957
 Buku Teks
Frank, William W.
How to outsell : the born salesman / by William W. Frank and Charless L. Lapp
Macmillan, 1959
 Buku Teks
Allen, Peter, author
Selling
Pitman, 1998
 Buku Teks
Rodgers, Mark, author
Accelerate the sale : kick-start your personal selling style to close more sales, faster
McGraw-Hill , 2011
 Buku Teks
Ahmad Hargi Septiawan, author
Evaluasi pelatihan Selling Skill karyawan bagian Sales Promotion Girl PT. Guna Layan Kuasa Jakarta Pusat = Evaluation training of Selling Skill about employees sales Promotion Girl employees PT. Guna Layan Kuasa Jakarta Pusat
Universitas Indonesia, 2013
 UI - Skripsi (Membership)
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