Gaya APA
Wills, Gordon. (1971).
Contemporary Marketing .
Great Britain:
Pitman Books.
Gaya Chicago
Wills, Gordon.
Contemporary Marketing.
Great Britain:
Pitman Books,
1971.
Buku Teks.
Gaya MLA
Wills, Gordon.
Contemporary Marketing.
Great Britain:
Pitman Books,
1971.
Buku Teks.
Gaya Turabian
Wills, Gordon.
Contemporary Marketing.
Great Britain:
Pitman Books,
1971.
Buku Teks.