Hunt, J. W.
McGraw-Hill, 1977
Buku Teks
Stones, Edgar
Routledge , 1992
Buku Teks
Reynolds, John I.
International Labour Office, 1980
Buku Teks
Clardy, Alan, author
American Management Association, 2012
eBooks
P.L. Sanjeev Reddy, editor; Rajesh Singh, editor
Kanishka , 2006
Buku Teks