Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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