Παραπομπή σε μορφή APA (7η εκδ.)

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

Παραπομπή σε μορφή Chicago (17η εκδ.)

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

Παραπομπή σε μορφή MLA (9th εκδ.)

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