Shankle, G. E. (1933). Washington, state name, flag, seal, song, bird, flower, and other symbols: A study based on historical documents giving the origin and significance of the state name, nicknames, motto, seal, flag, flower, bird, song, and descriptive comments on the capitol building and on some of the outstanding state histories, with facsimiles. H. W. Wilson.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Shankle, George Earlie. Washington, State Name, Flag, Seal, Song, Bird, Flower, and Other Symbols: A Study Based on Historical Documents Giving the Origin and Significance of the State Name, Nicknames, Motto, Seal, Flag, Flower, Bird, Song, and Descriptive Comments on the Capitol Building and on Some of the Outstanding State Histories, with Facsimiles. New York: H. W. Wilson, 1933.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Shankle, George Earlie. Washington, State Name, Flag, Seal, Song, Bird, Flower, and Other Symbols: A Study Based on Historical Documents Giving the Origin and Significance of the State Name, Nicknames, Motto, Seal, Flag, Flower, Bird, Song, and Descriptive Comments on the Capitol Building and on Some of the Outstanding State Histories, with Facsimiles. H. W. Wilson, 1933.