edited by Allan Cochrane, Chris Hamnett and Linda McDowell
Harper and Row, 1981
Buku Teks
Broadbent, Geoffrey, author
Chichester: John Wiley & Sons, 1980
Buku Teks
edited by Gerald E. Caiden and Heinrich Siedentopf
LexingtonBooks, 1982
Buku Teks
edited by Warren C. Robinson
Population Council, 1975
Buku Teks
edited by Greg Crouch, Ted Wheelwright, Ted Wilshire
Penguin Books, 1980
Buku Teks