Kay, Emanuel
Amacom , 1974
Buku Teks
Breen, George Edward, 1911-, author
American Management Associations, 1983
Buku Teks
Frohman, Alan L., author
McGraw-Hill, 1992
Buku Teks
Holcombe, Arthur N.
Harvard University Press, 1940
Buku Teks
Campbell, John C., author
Frederick A. Preger, 1960
Buku Teks