Poppy, Willard J.
Prentice-Hall, 1965
Buku Teks
Haas, Francis J.
Buku Teks
Frost, Frank J.
D.C Heath, 1980
Buku Teks
Buck, Pearl S. (Pearl Sydenstricker), 1892-1973, author
John Day, 1962
Buku Teks
Hulbert, Homer B., author
Yonsei University Press, 1969
Buku Teks