Charles Scribner's Sons, 1964
Buku Referensi
Ellis, Joseph J., author
Alfred A. Knopf, 2003
Buku Teks
oratio Alger Association of Distinguished Americans, 1996
Buku Teks
edited by Morton Borden
Rand McNally, 1961
Buku Teks
Daft, Richard L., 1964-, author
South-Western Cengage Learning, 2012
Buku Teks