Bethman, D. (1988). I found it!: A history of early Whatcom County bottles (2nd ed.). D. Bethman].
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBethman, David. I Found It!: A History of Early Whatcom County Bottles. 2nd ed. [Bellingham, Wash. (3307 Bennett Dr., 98225): D. Bethman], 1988.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBethman, David. I Found It!: A History of Early Whatcom County Bottles. 2nd ed. D. Bethman], 1988.
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