Carter, Gregg Lee, author
[American Management Association, ], 2006
eBooks
Pickering, Peg, author
Erlangga, 2001
Buku Teks
Mather, Hal, author
McGraw-Hill, 1984
Buku Teks
Humphries, john
Groiler International, 1993
Buku Teks
Nicholson, John, author
BBC Books , 1992
Buku Teks