Friend, J.K.
Tavistock Publications, 1974
Buku Teks
Glasson, John, author
Hutchinson, 1975
Buku Teks
edited by John Friedmann and William Alonso
MIT Press, 1965
Buku Teks
edited by John Friedmann and William Alonso
MIT Press, 1975
Buku Teks
Freeman, T.W., author
Hutchinson University Library, 1974
Buku Teks