Jerome, William Travers
John Wiley & Sons, 1961
Buku Teks
Martindell, Jackson
Harper & Row Publishers, 1962
Buku Teks
edited by Albert Newgardsen
American Management Association, 1958
Buku Teks
O`Donnell, Paul D., author
Prentice-Hall, 1952
Buku Teks
Niece, E.H. Mac, author
John Wiley & Sons, 1961; 1957
Buku Teks