Cita APA (7th ed.)

Ryan,Damian. (2017). Understanding digital marketing (4.). Kogen page Ltd.

Cita Chicago (17th ed.)

Ryan,Damian. Understanding Digital Marketing. 4. London: Kogen page Ltd, 2017.

Cita MLA (9th ed.)

Ryan,Damian. Understanding Digital Marketing. 4. Kogen page Ltd, 2017.