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 Washington, state name, flag, seal, song, bird, flower, and other symbols: A study based on historical documents giving the origin and significance of the state name, nicknames, motto, seal, flag, flower, bird, song, and descriptive comments on the capitol building and on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.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रShankle, 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 Washington, State Name, Flag, Seal, Song, Bird, Flower, and Other Symbols: A Study Based on Historical Documents Giving the Origin and Significance of the State Name, Nicknames, Motto, Seal, Flag, Flower, Bird, Song, and Descriptive Comments on the Capitol Building and on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.
एमएलए (8वां संस्करण) प्रशस्ति पत्रShankle, 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 Washington, State Name, Flag, Seal, Song, Bird, Flower, and Other Symbols: A Study Based on Historical Documents Giving the Origin and Significance of the State Name, Nicknames, Motto, Seal, Flag, Flower, Bird, Song, and Descriptive Comments on the Capitol Building and on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.