Utusan Publications & Distributors Sdn Bhd, 2005
Buku Teks
Boyd, Martin, author
Lansdowne Press, 1974
Koleksi Publik
Boyd, Martin, author
Lansdowne Press, 1974
Buku Teks
Lundin, William, 1923- , author
American Management Association, 2009
eBooks
edited by John Ayto
Helicon, 1994
Buku Referensi