Adams, T. F. M.
Kodansha International, 1972
Buku Teks
Kojima, Kiyoshi
Croom Helm, 1977
Buku Teks
Allen, G.C.
Oxford University Press, 1966
Buku Teks
Broadbridge, Seymour
Frank Cass, 1976
Buku Teks
edited by Gianni Fodella
Bocconi University, 1975
Buku Teks