United States. Congress. Senate. Committee on Interior and Insular Affairs. Subcommittee on Parks and Recreation. (1967). The North Cascades: Hearings, Ninetieth Congress, first session. U.S. Govt. Print. Off..
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)United States. Congress. Senate. Committee on Interior and Insular Affairs. Subcommittee on Parks and Recreation. The North Cascades: Hearings, Ninetieth Congress, First Session. Washington: U.S. Govt. Print. Off., 1967.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)United States. Congress. Senate. Committee on Interior and Insular Affairs. Subcommittee on Parks and Recreation. The North Cascades: Hearings, Ninetieth Congress, First Session. U.S. Govt. Print. Off., 1967.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.