Gaya APA
Wills, Gordon, Seibert, Joseph. (1970).
Marketing Research .
England:
Penguin Books.
Gaya Chicago
Wills, Gordon, Seibert, Joseph.
Marketing Research.
England:
Penguin Books,
1970.
Buku Teks.
Gaya MLA
Wills, Gordon, Seibert, Joseph.
Marketing Research.
England:
Penguin Books,
1970.
Buku Teks.
Gaya Turabian
Wills, Gordon, Seibert, Joseph.
Marketing Research.
England:
Penguin Books,
1970.
Buku Teks.