Research methods in education /
Cohen, Louis.
Research methods in education / Louise Cohen and Lawrence Manion. - London : Croom Helm, 1980. - 328 p.
0856649171 :
Educational Research.
LB1028 / .C64
Research methods in education / Louise Cohen and Lawrence Manion. - London : Croom Helm, 1980. - 328 p.
0856649171 :
Educational Research.
LB1028 / .C64