Research techniques in nondestructive testing
edited by R.S. Sharpe
Academic Press, 1982
 Buku Teks SO
Rossman, Gretchen B.
Learning in the field : an introduction to qualitative research
Sage, 2003
 Buku Teks SO
Handbook of research on mathematics teaching and learning
edited by Douglas A. Grouws
Macmillan Library Reference, 1992
 Buku Referensi
Slavin, Robert E.
Cooperative learning: theory, research, and practice
Allyn and Bacon, 1995
 Buku Teks
Athanassios Jimoyiannis
Research on e-learning and ICT in education
Springer, 2012
 eBooks