共 24 条
[1]
BARNETT HG, 1953, INNOVATION
[2]
COPP JH, 1956, 83 KANS AGR EXPT STA
[3]
ERASMUS CJ, 1961, MAN TAKES CONTROL CU, P17
[4]
FLIEGEL, IN PRESS
[5]
FLIEGEL, 1956, RURAL SOCIOLOGY, V21, P284
[6]
FLIEGEL, 1956, RURAL SOCIOLOGY, V21, P292
[7]
FLIEGEL FC, 1965, RURAL SOCIOL, V30, P278
[10]
Kivlin J.E., 1960, THESIS PENNSYLVANIA