40. 参照資料
• http://en.wikipedia.org/wiki/Inbound_marketing
• http://www.hubspot.com/Outbound-vs-Inbound-Marketing/
• http://www.slideshare.net/HubSpot/inbound-marketing-101-mike-volpe-hubspot-
presentation
• http://www.slideshare.net/HubSpot/the-2011-state-of-inbound-marketing
• 「Inbound Marketing: Get Found Using Google, Social Media, and Blogs」
Brian Halligan and Dharmesh Shah
• 「Content Rules」
Ann Handley and C.C. Chapman