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Gallery of the Republic, (accessed August 4, 2008).

Handbook of Texas Online, s.v., (accessed November 12, 2008).

Martin, James C. Maps of Texas and the Southwest, 1513-1900. Amon Carter Museum, Fort Worth, Texas, 1984.

Martin, Robert S. and James C. Martin. Contours of Discovery: Printed Maps Delineating the Texas and Southwestern Chapters in the Cartographic History of North America, 1513-1930. Texas State Historical Association, Austin, 1982.

Stein, Mark. How the States Got Their Shapes. HarperCollins Publishers, New York, 2008.

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