Bethman, D. (1991). The pioneer drug store: A history of Washington State drug stores and their artifacts. D. Bethman.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBethman, David. The Pioneer Drug Store: A History of Washington State Drug Stores and Their Artifacts. [Bellingham, Wash.] (3307 Bennett Drive, Bellingham 98225): D. Bethman, 1991.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBethman, David. The Pioneer Drug Store: A History of Washington State Drug Stores and Their Artifacts. D. Bethman, 1991.
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