: Farming Systems Research and Development: Guidelines for Developing Countries . W. W. Shaner, P. F. Philipp, W. R. Schmehl.
1982 ◽
Vol 11
(2)
◽
pp. 139-153
◽
1998 ◽
Vol 38
(1)
◽
pp. 101
◽
1989 ◽
1986 ◽
Vol 23
(4)
◽
pp. 201-221
◽
Keyword(s):
1984 ◽
Vol 15
(2)
◽
pp. 101-123
◽
1970 ◽
Vol 34
(2)
◽
pp. 255-261