Lee, Alec M., author
Macmillan, 1970
Buku Teks
Kerzner, Harold R., author
John Wiley & Sons, 2017
Buku Teks
Johnson, Richard A., author
McGraw-Hill, 1973
Buku Teks
Dreger, J. Brian, author
Van Nostrand Reinhold, 1992
Buku Teks
Lewis, James P., author
Amacom, 1997
Buku Teks