Allen, Peter
Selling
Pitman, 1998
 Buku Teks SO
Robeson, James F.
Selling
Richard D. Irwin , 1978
 Buku Teks SO
Panic selling
 Artikel Jurnal
Allen, Robert Y.
Selling dynamics
McGraw-Hill, 1984
 Buku Teks SO
Wingate, John W.
Fundamentals of selling
South-Western Publishing, 1959
 Buku Teks SO