Harvard University. Landscape Architecture Research Office, Conservation Foundation, & Belknap, R. K. (1967). Three approaches to environmental resource analysis. Prepared by the Landscape Architecture Research Office, Graduate School of Design, Harvard University. Research associates: Raymond K. Belknap and John G. Furtado. Research assistants. Conservation Foundation.

Harvard University. Landscape Architecture Research Office, Conservation Foundation, и Raymond K. Belknap. Three Approaches to Environmental Resource Analysis. Prepared by the Landscape Architecture Research Office, Graduate School of Design, Harvard University. Research Associates: Raymond K. Belknap and John G. Furtado. Research Assistants. Washington, D. C: Conservation Foundation, 1967.

Harvard University. Landscape Architecture Research Office, et al. Three Approaches to Environmental Resource Analysis. Prepared by the Landscape Architecture Research Office, Graduate School of Design, Harvard University. Research Associates: Raymond K. Belknap and John G. Furtado. Research Assistants. Conservation Foundation, 1967.