See Allo

Sutton, Kelso, author

The technique of selling

McGraw-Hill, 1949

Buku Teks

Allen, Peter, author

Pitman, 1998

Buku Teks

Allen, Robert Y., author

Selling dynamics

McGraw-Hill, 1984

Buku Teks

Wingate, John W., author

Fundamentals of selling

South-Western Publishing, 1959

Buku Teks

Kurtz, David L., author

Professional selling

Business Publications, 1982

Buku Teks

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