共 4 条
[1]
Lionberger HF, 1953, RURAL SOCIOL, V18, P327
[2]
MARSH CP, 1959, RURAL SOCIOLOGY, V24
[3]
RAHUDKAR WB, 1960, NAGPUR AGRICULTURAL, V34, P4
[4]
Wilkening EA, 1952, RURAL SOCIOL, V17, P272