MLA

Harris, Dianne Suzette, and D. Fairchild Ruggles. Sites Unseen : Landscape and Vision. Pittsburgh, PA: University of Pittsburgh Press, 2007.

APA

Harris, D. Suzette, & Ruggles, D. Fairchild. (2007). Sites unseen : landscape and vision. Pittsburgh, PA: University of Pittsburgh Press.

Chicago

Harris, Dianne Suzette., and D. Fairchild Ruggles. Sites Unseen: Landscape and Vision. Pittsburgh, PA: University of Pittsburgh Press, 2007.