edited by Heather Fry, Steve Ketteridge and Stephanie Marshall
Routledge, 2009
Buku Referensi
McAvinia, Claire
Chandos Publishing, an imprint of Elsevie, 2016
Buku Teks
Ramsden, Paul
Routledge , 1992
Buku Teks
Bates, Tony, 1939-
Jossey-Bass, 2011
Buku Teks
edited by Jean-Eric Pelet
Igi Global, 2014
Buku Teks