Sharkansky, Ira, author
McGraw-Hill , 1978
Buku Teks
Griffith, Ernest
Frederick A. Praeger, 1954
Buku Teks
Ferguson, John H., author
McGraw-Hill, 1981
Buku Teks
Ferguson, John H., author
McGraw-Hill, 1981
Buku Teks
by James W. Ceaser ... [and others]
McGraw-Hill , 1984
Buku Teks