APA-ийн эшлэл(7 дахь хэвлэлт)

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

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

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

MLA -ийн эшлэл (9 дэх хэвлэлт)

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