Bensoussan, Alain.
North-Holland Pub. Co, 1974
Buku Teks
Johnson, Ross H., author
Houghton Miffiln, 1976
Buku Teks
Loomba, N. Paul
Macmillan, 1978
Buku Teks
Bell, Colin E.
Richard D. Irwin, 1977
Buku Teks
Marris, Robin
Free Press of Glencoe, 1964
Buku Teks