edited by Dagobert D. Runes
Littlefield, Adams, 1962
Buku Teks
Wielenga, Friso. author
Bloomsbury Academic, 2015
Buku Teks
Grenville, J.A.S., author
Routledge, 2005
Buku Teks
Crockatt, Richard, author
Oxford University Press, 2016
eBooks
Hoffding, Harold, author
Macmillan, 1955
Buku Teks