Educational research :
Educational research : quantitative, qualitative, and mixed approaches /
Burke Johnson and Larry Christensen.
- 4th ed.
- USA : SAGE Publications Inc., 2012.
- 620 p. ; ill. some col. ; 26 cm.
9781412978286
LB 1028 / .J59 2012
9781412978286
LB 1028 / .J59 2012