McGuire, Edna
Macmillan, 1954
Buku Teks
Jones, Howard Mumford
Harvard University Press, 1964
Buku Teks
Becker, Carl L. (Carl Lotus), 1873-1945
Alfred . A. Knopf, 1945
Buku Teks
Johnson, Edgar N.
Cornell University Press, 1950
Buku Teks
Mason, Alpheus Thomas,1899-1989
Prentice-Hall, 1959
Buku Teks