United States. Congress. House. Committee on Interior and Insular Affairs. Subcommittee on National Parks and Recreation. (1968). The North Cascades: Hearings, Ninetieth Congress, second session .. U.S. Govt. Print. Off..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रUnited States. Congress. House. Committee on Interior and Insular Affairs. Subcommittee on National Parks and Recreation. The North Cascades: Hearings, Ninetieth Congress, Second Session .. Washington: U.S. Govt. Print. Off., 1968.
एमएलए (8वां संस्करण) प्रशस्ति पत्रUnited States. Congress. House. Committee on Interior and Insular Affairs. Subcommittee on National Parks and Recreation. The North Cascades: Hearings, Ninetieth Congress, Second Session .. U.S. Govt. Print. Off., 1968.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.