Murphy, Tom
American Management Association, 2007
eBooks
Brink, Randall
Bloomsbury, 1994
Buku Teks SO
edited by Edward T. James
Charles Scribner`s Sons, 1964
Buku Teks SO
Rossiter, Clinton, 1917-1970
Harcourt Brace, 1960
Buku Teks SO
Powell, Anthony, 1905-2000
London John Lehmann 1948
Buku Teks