Gaya APA
D., P., J. (1996).
Teleselling : a self-teaching guide / James D. Porterfield (Edisi yang diperbaharui).
New York:
John Wiley n Sons.
Gaya MLA
Porterfield, James, D..
"Teleselling : a self-teaching guide / James D. Porterfield".
Edisi yang diperbaharui
New York:
John Wiley n Sons,
1996.
Textbook.