Brouwer, M.A.W. (Martinus Antonius Wesselinus), 1923-, author
Alumni, 1986
Buku Teks
Mayer, Frederick, author
American Book Company, 1951
Buku Klasik
Hoffding, Harold
Dover Publishing, 1955
Buku Teks
Kenny, Anthony
Oxford University Press, 2008
Buku Teks
Hoffding, Harold, author
Macmillan, 1955
Buku Teks