Ranney, Austin, author
Harcourt, Brace and Company, 1956
Buku Teks
Ferguson, John H., author
McGraw-Hill, 1947
Buku Teks
Ferguson, John H., author
McGraw-Hill, 1981
Buku Teks
Ferguson, John H., author
McGraw-Hill, 1965
Buku Teks
Pritchett, C. Herman, author
McGraw-Hill, 1963
Buku Teks