共 31 条
[1]
[Anonymous], 1983, NAT RISK IMP ED REF
[2]
[Anonymous], 1994, SURV RES METHODS-GER
[4]
BACH GL, 1965, AM EC REV, V57, P329
[5]
BECKER WE, 1983, J ECON EDUC, V14, P4
[6]
BECKER WE, 1980, CAPSTONE EVALUATION, P125
[8]
BRENNAN DC, 1982, STUDY STATE MANDATES