Camp, O. A., & McGrew, P. C. (1969). History of Washington's soil and water conservation districts.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCamp, Oscar A., और Paul Cornelius McGrew. History of Washington's Soil and Water Conservation Districts. [Everson? Wash.], 1969.
एमएलए (8वां संस्करण) प्रशस्ति पत्रCamp, Oscar A., और Paul Cornelius McGrew. History of Washington's Soil and Water Conservation Districts. 1969.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.