Stebbins, Robert A., author
Sage, 2001
Buku Teks
Webster, Murray, editor
Academic Press, 2014
eBooks
Baert, Patrick, author
Polity Press, 2005
Buku Teks
Yayasan Obor Indonesia,
Majalah, Jurnal, Buletin
Berg, Bruce L. (Bruce Lawrence), 1954-, author
Pearson, 2004
Buku Teks