Majalah, Jurnal, Buletin
edited by Peter Reason, Hilary Bradbury
Sage , 2013
Buku Referensi
Suchman, Edward A., author
Russell Sage Foundation, 1967
Buku Teks
Craig, Dorothy Valcarcel, author
Jossey-Bass, 2009
Buku Teks
Schmuck, Richard A., author
Skylight, 1998
Buku Teks