Washington State Highway Commission, Washington (State). Department of Highways, Dugovich, W., Peabody, L. D., & Goodfellow, C. W. (1966). Washington highways to history: A guide to the historical markers along Washington State highways. Washington State Highway Commission : Dept. of Highways.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Washington State Highway Commission, Washington (State). Department of Highways, William Dugovich, Larry D. Peabody, و Chet W. Goodfellow. Washington Highways to History: A Guide to the Historical Markers Along Washington State Highways. [Olympia, Wash.]: Washington State Highway Commission : Dept. of Highways, 1966.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Washington State Highway Commission, et al. Washington Highways to History: A Guide to the Historical Markers Along Washington State Highways. Washington State Highway Commission : Dept. of Highways, 1966.