Kohn, Hans, author
D. Van Nostrand, 1965
Buku Teks
Urwick, Lyndall F., author
Pitman Publishing Corporation , 1958
Buku Teks
Namho, Lee, author
EastBridge, 2005
Buku Teks
Keylor, William R., 1944-
Oxford University Press, 1996
Buku Teks
edited by Chang Yun-Shik and Steven Hugh Lee
Routledge, 2006
Buku Teks