Katz, Bernard S.
Garland Publihing, INC, 1988
Buku Teks
Mehta, J.K., author
Caitanya Publishing House, 1967
Buku Teks
Mussey, Henry R.
Ginn and Company, 1947
Buku Teks
McKenna, John R.
Harper and Row , 1971
Buku Teks
Burns, Arthur Edward, author
Harcourt, Brace, 1948
Buku Teks