Ryan, D. (2012). Understanding Digital Marketing (2nd.). Kogan Page.
Chicago-čujuhus (17. p.)Ryan, Damian. Understanding Digital Marketing. 2nd. Kogan Page, 2012.
MLA-čujuhus (9. p.)Ryan, Damian. Understanding Digital Marketing. 2nd. Kogan Page, 2012.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.