Schultz, Theodore W.
Invesment in human capital: the role of education and of research
Free Press, 1971
Buku Teks
The Encyclopedia of human development and education: theory, research, and studies
edited by R. Murray Thomas
Pergamon Press, 1990
Buku Referensi
Best, John W.
Research in education
Pearson, 2014
Buku Teks
Best, John W.
Research in education
Prentice-Hall of India, 1982
Buku Teks
Best, John W.
Research in education
Prentice-Hall, 1977
Buku Teks