edited by Jessie Ee
McGraw-Hill, 2004
Buku Teks
Roche, Douglas, author
NC Press, 1979
Buku Teks
Rabe, Cynthia Barton, author
American Management Association, 2006
eBooks
Terkel, Studs, author
Pantheon Books, 1974
Buku Teks
Putnam, Mabel Raef
Charles Scribner's, 1954
Buku Teks