May, Erskine (1896): , 11. utg. London: Longmans, Green and Co. Mackenzie, K.R. (1950): , Pelican Books. Pollard, Albert F. (1926): , 2. utg. London: Longmans, Green and Co. Porritt, Edward, & Porritt, Annie G. (1903): . Cambridge: Cambridge University Press.