Cook, Fred J., author
Encyclopaedia Britannica Press, 1961
Buku Teks
Hammer, U. Theodore
Dr. W. Junk, 1986
Buku Teks
Allen, Theodore, author
McGraw-Hill Kogakusha, c1972
Buku Teks
Plucknett, Theodore F. T.
Little, Brown and Company, 1956
Buku Teks
Sills, Theodore R
Richard D.Irwin,Inc, 1951
Buku Teks