Woll, Peter
Little, Brown & Co., 1979
Buku Teks
Leslie B. Alexander; Phyllis Solomon
Thomson Brooks/Cole, 2006
Buku Teks
Pak, Un-bong, 1960-, author
Silcheon, 2003
Buku Teks
Moodie, A.E.
Hutchinson,s University Library, 1947
Buku Teks
Huntington, Samuel P., author
The Belknap Press, 1981
Buku Teks