World Executive's Digest, 1981
Buku Teks
Pascale, Richard T.
Simon & Schuster, 1981
Buku Teks
Keitaro Hasegawa
Kodansha International, 1986
Buku Teks
Jackson, Keith
Routledge, Taylor & Francis Group, 2003
Buku Teks
Waters, Dan
Prentice-Hall, 1991
Buku Teks