Penggayaan APA
RYAN, William T.. (1981).
A guide to marketing .
Illinois:
Learning Systems Company.
Chicago Style
RYAN, William T..
A guide to marketing.
Illinois:
Learning Systems Company,
1981.
Buku.
MLA Style
RYAN, William T..
A guide to marketing.
Illinois:
Learning Systems Company,
1981.
Buku.
Turabian Style
RYAN, William T..
A guide to marketing.
Illinois:
Learning Systems Company,
1981.
Buku.