12
Clegg, Stewart.
| Routledge & Paul |
1975
13
Simmie, James.
| Macmillan |
1981
14
Smith, Hedrick.
| Random House |
1988
15
Castells, Manuel.
| Macmillan |
1978
16
Oppenheim, Felix E.,
| University of Chicago Press |
1981