Gaya APA
Leterman, Elmer G.. (1976).
Modern Business Sales and Sales Management .
USA (Amerika):
Grolier.
Gaya Chicago
Leterman, Elmer G..
Modern Business Sales and Sales Management.
USA (Amerika):
Grolier,
1976.
Text.
Gaya MLA
Leterman, Elmer G..
Modern Business Sales and Sales Management.
USA (Amerika):
Grolier,
1976.
Text.
Gaya Turabian
Leterman, Elmer G..
Modern Business Sales and Sales Management.
USA (Amerika):
Grolier,
1976.
Print.