"Brief Biographical Sketch of George Washington", The Celebrated Jumping Frog of Calaveras County, and Other Sketches http://books.google.com/books?id=kqMDAAAAQAAJ (1867), ed. John Paul
Cited by: William E. Phipps, Mark Twain's Religion https://books.google.nl/books?id=y8e2zLpDngQC&pg=PA18&dq=%22+He+was+ignorant+of+the+commonest+accomplishments+of+youth.+He+could+not+even+lie%22&hl=nl&sa=X&ved=0ahUKEwjVpM31tsbMAhXFshQKHZ32Ci0Q6AEIJTAB#v=onepage&q=%22%20He%20was%20ignorant%20of%20the%20commonest%20accomplishments%20of%20youth.%20He%20could%20not%20even%20lie%22&f=false, Mercer University Press, 2003, p. 18
Richard Locke, Critical Children: The Use of Childhood in Ten Great Novels https://books.google.nl/books?id=38erAgAAQBAJ&pg=PA12&dq=%22+He+was+ignorant+of+the+commonest+accomplishments+of+youth.+He+could+not+even+lie%22&hl=nl&sa=X&ved=0ahUKEwjVpM31tsbMAhXFshQKHZ32Ci0Q6AEIPTAE#v=onepage&q=%22%20He%20was%20ignorant%20of%20the%20commonest%20accomplishments%20of%20youth.%20He%20could%20not%20even%20lie%22&f=false, Columbia University Press, p. 12