Myrdal, Gunnar, 1898-
Obyektivitas penelitian sosial = Objectivity in social research
LP3ES, 1988
 Buku Teks
Myrdal, Gunnar, 1898-
Obyektivitas penelitian sosial = Objectivity in social research
LP3ES , 1982
 Buku Teks
Link and match penelitian dan pengembangan pelayanan kesejahteraan sosial: Social welfare services research and development's link and match
 Artikel Jurnal
Axtell, Guy, 1957-
Objectivity
MA Polity Press, 2016
 Buku Teks SO
Nurul Zuriah
Penelitian tindakan (action research) dalam bidang pendidikan dan sosial
Lembaga Penelitian Universitas Muhammadiyah Malang, 2001
 Buku Teks