The Nuttall Encyclopedia
Man of letters, brother of preceding; self-taught; has written several works under the pseudonym of ZZ; distinguished himself at one time as a chess-player; b . 1869.
Wood, James, ed. Entry for 'Zangwill, Louis'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/z/zangwill-louis.html. Frederick Warne & Co Ltd. London. 1900.