41
Hartlyn, Jonathan.
| Westview Press |
1986
42
45
Baird, Russell N.
| Holt, Rinehart, and Winston |
1987
46
Mellard, Charles W
| Merrill Pub. Co. |
1987
48
Baird, Russell N.
| Holt, Rinehart, and Winston |
1987
50
McLean, James E.
| University Park Press |
1972