Sierra Club, Pyramid Productions (Firm), Spacek, S., Serrill, W., Hedreen, A., & Thompson, R. (2003). Wild America: Protecting the lands explored by Lewis & Clark. Pyramid Productions ; Sierra Club.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSierra Club, Pyramid Productions (Firm), Sissy Spacek, Ward Serrill, Ann Hedreen, और Rustin Thompson. Wild America: Protecting the Lands Explored by Lewis & Clark. [S.l.]: Pyramid Productions ; Sierra Club, 2003.
एमएलए (8वां संस्करण) प्रशस्ति पत्रSierra Club, et al. Wild America: Protecting the Lands Explored by Lewis & Clark. Pyramid Productions ; Sierra Club, 2003.
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