Reference author: Donovan Rypkema

Rypkema, D. (2003). Economic Benefits of Heritage Conservation: Keynote Speech of CAMA Conference

Rypkema, D. (2005). Closing presentation: Heritage and Sustainability \textendash Lessons Learned in America

Rypkema, D. (2005). Economics, Sustainability, and Historic Preservation Retrieved from http://www.nationaltrust.org/advocacy/case/Rypkema_Speech_on_Sustainability_in_Portland.pdf