Steiner, William Howard, author
Henry Holt, 1941
Buku Teks
Steiner, William Howard, author
Henry Holt, 1956
Buku Teks
Luckett, Dudley G., author
McGraw-Hill , 1984
Buku Teks
Stokes, Milton L.
The Ronald Press Co, 1955
Buku Teks
Shapiro, Harry L.
UNESCO, 1953
Buku Teks
Crouse, William H., author
McGraw-Hill , 1984
Buku Teks