Cytowanie według stylu APA (wyd. 7)

Harden, L., & Heyman, B. (2009). Digital engagement: Internet marketing that captures customers and builds intense brand loyalty. American Management Association.

Cytowanie według stylu Chicago (wyd. 17)

Harden, Leland, i Bob Heyman. Digital Engagement: Internet Marketing That Captures Customers and Builds Intense Brand Loyalty. New York: American Management Association, 2009.

Cytowanie według stylu MLA (wyd. 9)

Harden, Leland, i Bob Heyman. Digital Engagement: Internet Marketing That Captures Customers and Builds Intense Brand Loyalty. American Management Association, 2009.