edited by Nathan Glick
United Sates Information Agency, 1989
Buku Teks
Wilfred D. Webb
Thomas Y. Crowell Company, 1961
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, 1981
Buku Teks