Oregon. Department of Geology and Mineral Industries, Western Guide Publishers, & Preston, R. N. (1975). Oregon gold & gems maps: Then & now. Western Guide Publishers.
Цитирование в стиле Чикаго (17-е изд.)Oregon. Department of Geology and Mineral Industries, Western Guide Publishers, и Ralph N. Preston. Oregon Gold & Gems Maps: Then & Now. Corvallis [Or.]: Western Guide Publishers, 1975.
Цитирование MLA (8-е изд.)Oregon. Department of Geology and Mineral Industries, et al. Oregon Gold & Gems Maps: Then & Now. Western Guide Publishers, 1975.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.