Japan Small Business Research Institute , 1995
Buku Teks
Travel Bureau, 1975
Buku Referensi
Kojima, Kiyoshi
Croom Helm, 1977
Buku Teks
Porter, Hal, 1911-1984, author
Angus & Robertson, 1970
Buku Teks
Tanaka, Kakuei, author
The Simul Press, 1973
Buku Teks