Barnet, Sylvan, author
Batsford Academic and Educational, 1985
Buku Teks
Barnet, Sylvan, author
Little, Brown, 1979
Buku Teks
Fairbairn, Gavin, author
McGraw-Hill, 2012
Buku Teks
Arthur, Diane, author
American Management Association, 1997
eBooks
Pechenik, Jan A., author
Pearson Longman, 2007
Buku Teks