Gaya APA

CHAFFEY, D., CHADWICK, F, E. (2019). DIGITAL MARKETING STRAREGY, IMPLEMENTATION AND PRACTICE (7). New York: pearson education international.

Gaya MLA

CHAFFEY, DAVE., CHADWICK, FIONA, ELLIS. "DIGITAL MARKETING STRAREGY, IMPLEMENTATION AND PRACTICE". 7 New York: pearson education international, 2019. Text.