Watanabe, Akio
Melbourne University Press, 1970
Buku Teks
Japan Small Business Research Institute , 1995
Buku Teks
Kokusei-Sha Corporation , 1986
Buku Teks
The Kokusei-Sha, 1994
Buku Teks
Jansen, Marius B.
Rand Mc.Nally College Publishing , 1975
Buku Teks