Gaya APA
Roberts, Mary Lou, Berger, Paul O. (1999).
Direct marketing management (2e).
New Jersey:
Prentice Hall.
Gaya Chicago
Roberts, Mary Lou, Berger, Paul O.
Direct marketing management.
2e
New Jersey:
Prentice Hall,
1999.
Buku.
Gaya MLA
Roberts, Mary Lou, Berger, Paul O.
Direct marketing management.
2e
New Jersey:
Prentice Hall,
1999.
Buku.
Gaya Turabian
Roberts, Mary Lou, Berger, Paul O.
Direct marketing management.
2e
New Jersey:
Prentice Hall,
1999.
Buku.