2
Dahl, Robert Alan,
| Yale University Press |
1973
5
Wilson, Graham K
| Clarendon Press:Oxford University Press |
1981
6
Wolpin, Miles D.
| Allanheld, Osmun |
1981
8
Wesson, Robert G.
| Praeger |
1982
9
Wesson, Robert G.
| Praeger |
1982