Hancock, William A., author
McGraw-Hill, 1982
Buku Teks
Hanna, Thomas M., author
American Management Association, 2007
eBooks
Koshi, George M., author
Charles E. Tuttle, 1970
Buku Teks
Steingold, Attorney Fred S., author
Nolo, 2006
Buku Teks
James, Vaughn E., author
American Management Association, 2009
eBooks