Takagi, Haruo, author
UMI Research Press, 1984
Buku Teks
World Executive's Digest, 1981
Buku Teks
Pascale, Richard T.
Simon & Schuster, 1981
Buku Teks
Hasegawa, Keitaro, author
Kodansha International, 1986
Buku Teks
Jackson, Keith, author
Routledge, Taylor & Francis Group, 2003
Buku Teks