Agger, Ben
Oxford University Press, 2013
Buku Teks
Gomm, Roger, author
Palgrave McMillan, 2004
Buku Teks
Fuchs, Christian
SAGE, 2014
Buku Teks
Kirst-Ashman, Karen Kay, author
Cengage Learning , 2017
Buku Teks
Kirst, Ashman Karen Kay, author
Cengage Learning, 2013
Buku Teks