APA Style
RYAN, William T. ((,d,)).
Principles of Marketing .
3th ed:
Learning Systems Company.
Chicago Style
RYAN, William T.
Principles of Marketing.
3th ed:
Learning Systems Company,
(,d,).
Text.
MLA Style
RYAN, William T.
Principles of Marketing.
3th ed:
Learning Systems Company,
(,d,).
Text.
Turabian Style
RYAN, William T.
Principles of Marketing.
3th ed:
Learning Systems Company,
(,d,).
Print.