Gaya APA
McDonald, Malcolm H.B, Leppard, John W. (1988).
Effective industrial selling .
London:
Heinemann.
Gaya Chicago
McDonald, Malcolm H.B, Leppard, John W.
Effective industrial selling.
London:
Heinemann,
1988.
Buku.
Gaya MLA
McDonald, Malcolm H.B, Leppard, John W.
Effective industrial selling.
London:
Heinemann,
1988.
Buku.
Gaya Turabian
McDonald, Malcolm H.B, Leppard, John W.
Effective industrial selling.
London:
Heinemann,
1988.
Buku.