Gaya APA
Roberts, Mary Lou. (1989).
Direct marketing management .
Englewood Cliffs:
Prentice-Hall.
Gaya Chicago
Roberts, Mary Lou.
Direct marketing management.
Englewood Cliffs:
Prentice-Hall,
1989.
.
Gaya MLA
Roberts, Mary Lou.
Direct marketing management.
Englewood Cliffs:
Prentice-Hall,
1989.
.
Gaya Turabian
Roberts, Mary Lou.
Direct marketing management.
Englewood Cliffs:
Prentice-Hall,
1989.
.