Washington Water Power Company & Washington Water Power Company. Information and Special Activities Department. (1979). History of the Washington Water Power Company. Washington Water Power Company, Information and Special Activities Dept..
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Washington Water Power Company و Washington Water Power Company. Information and Special Activities Department. History of the Washington Water Power Company. [Spokane, Wash.]: Washington Water Power Company, Information and Special Activities Dept., 1979.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Washington Water Power Company و Washington Water Power Company. Information and Special Activities Department. History of the Washington Water Power Company. Washington Water Power Company, Information and Special Activities Dept., 1979.