Glover, S. L. (1936). Nonmetallic mineral resources of Washington, with statistics for 1933. State Printing Plant.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGlover, Sheldon L. Nonmetallic Mineral Resources of Washington, with Statistics for 1933. Olympia: State Printing Plant, 1936.
एमएलए (8वां संस्करण) प्रशस्ति पत्रGlover, Sheldon L. Nonmetallic Mineral Resources of Washington, with Statistics for 1933. State Printing Plant, 1936.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.