Cuff, Roger P "Mark Twain's Use of California Folklore in His Jumping Frog Story," Journal of American Folklore, Vol. 65, April, 1952, pp. 155-9.

Cuff traces Twain's use of the folklore of the California Gold Rush in "The Celebrated Jumping Frog of Calaveras County."

Lewis, Oscar. The Origin of "The Celebrated Jumping Frog of Calaveras County," Book Club of California, 1931,27 p.

Lewis outlines the history of this story, "from its origins in the mining-camps of the Sierra foothills during the early days of the Gold Rush to the time Mark Twain gave it world-wide fame."

Mornssey, Frank R. "The Ancestor of the 'Jumping Frog,'" The Bookman, Vol LIII, no. 2, April, 1921, pp. 143-5.

Morrissey recounts a tale about a man and his trained grasshopper, claiming that it is a prototype for Twain's story about Jim Smiley and Dan'l Webster.