Schultz, Theodore W.
Investment 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