"Hoyt's New Cyclopedia Of Practical Quotations" by Jehiel Keeler Hoyt, p. 598-600, Curiosities of Literature, Professors of Plagiarism and Obscurity, 1922.
"Hoyt's New Cyclopedia Of Practical Quotations" by Jehiel Keeler Hoyt, p. 461, The Literary Character, Illustrated by the History of Men of Genius (1795-1822), Chapter XXII, 1922.