Johnson, Edward Lea, author
Methuen, 1969
Buku Teks
Webb, Sidney, author
Longman, 1947
Buku Teks
Dallin, David J., author
Yale University Press, 1956
Buku Teks
Dallin, David J., author
Hollis & Carter, 1951
Buku Teks
edited by William E. Griffith
Lexington Books, 1976
Buku Teks