Gaya APA
Chapman, E, N. (1992).
Sales training basics : : a primer for those new to selling (3rd ed.).
Menlo Park, California:
Crisp Publications.
Gaya MLA
Chapman, Elwood, N..
"Sales training basics : : a primer for those new to selling".
3rd ed.
Menlo Park, California:
Crisp Publications,
1992.
BUKU.