Oregon State University, Corvallis. College of Liberal Arts, Clarke, R. O., & List, P. C. (1974). Environmental spectrum: Social and economic views on the quality of life. Van Nostrand.
Lua i Stíl Chicago (17ú heag.)Oregon State University, Corvallis. College of Liberal Arts, Ronald O. Clarke, agus Peter C. List. Environmental Spectrum: Social and Economic Views on the Quality of Life. New York: Van Nostrand, 1974.
Lua MLA (9ú heag.)Oregon State University, Corvallis. College of Liberal Arts, et al. Environmental Spectrum: Social and Economic Views on the Quality of Life. Van Nostrand, 1974.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.