edited by Masahiko Aoki and Ronald Dore
Oxford University Press, 1994
Buku Teks
Odhe, Thersten
Cooperative Lague of the USA, 1960
Buku Teks
Ravnholt, Henning
Det Danske Selskab, 1950
Buku Teks
Rasmussen, A. Eric
Co-operative College of Canada, 1975
Buku Teks
Digby, Margaret, author
Hutchinson University Library , 1960
Buku Teks