Heffner, R.M.S., author
University of Wisconsin Press, 1960
Buku Teks
Mol, Hendrik, 1919-1981, author
Mouton, 1963
Buku Teks
Mol, Hendrik, 1919-1981, author
Mouton, 1970
Buku Teks
edited by John K. Ryan
The Catholic University of America Press, 1963
Buku Teks
Bentley, John Edward, author
Littlefield, Adams, 1958
Buku Teks