Iwata, Ryushi
Asian Productivity Organizations, 1982
Buku Teks
Hasegawa, Keitaro, author
Kodansha International, 1986
Buku Teks
World Executive's Digest, 1981
Buku Teks
penyunting, B.N. Marbun
Pustaka Binaman Pressindo, 1983
Buku Teks
Matsumoto, Koji
Asian pProductivity Organization, 1982
Buku Teks