Krolokke, Charlotte
Sage Publications, 2006
Buku Teks
Kathryn Dindia, Steve Duck, editor
John Wiley & Sons, 2000
Buku Teks
Archer, John
Cambridge University Press, 2002
Buku Teks
edited by Vera Regitz-Zagrosek
Springer, 2012
eBooks
Lips, Hilary M.
McGraw-Hill, 2008
Buku Teks