Roberts, W. M., & Gatke, R. M. (1920). The letters of the Rev. William M. Roberts, third superintendent of the Oregon Missions. Ivy Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRoberts, William M., और Robert Moulton Gatke. The Letters of the Rev. William M. Roberts, Third Superintendent of the Oregon Missions. [Portland, Or.: Ivy Press, 1920.
एमएलए (8वां संस्करण) प्रशस्ति पत्रRoberts, William M., और Robert Moulton Gatke. The Letters of the Rev. William M. Roberts, Third Superintendent of the Oregon Missions. Ivy Press, 1920.
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