edited by Ken Goodwin and Alan Lawson
Macmillan, 1990
Buku Teks SO
Gilbert, Martin
Routledge, 1994
Buku Teks
Semmler, Clement
University of Queensland Press [distributed by International Scholarly Book Services, 1972
Buku Teks SO
Fredericks, Pierce
E.P. Dutton, 1960
Buku Teks SO
Fischer, Fritz
W.W. Norton & Company, 1967
Buku Teks SO