The Survey kit
Sage, 2003
 Buku Referensi
The handbook of social work research methods
editor, Bruce A. Thyer
Sage Publications, 2001
 Buku Referensi
Coates, John
The claims of sense: Moore, Wittgenstein, Keynes and the social science/John Coates
Cambridge Cambridge University Press 1996,
 Buku Teks
International social science bulletin
Paris : Unesco
 Majalah, Jurnal, Buletin
Handbook of research methods on social entrepreneurship
edited by Richard G. Seymour
Edward Elgar, 2012
 Buku Teks