edited by Kjell Erik Rudestam and Judith Schoenholtz-Read
Sage, 2002
Buku Referensi
edited by Kjell Erik Rudestam, Judith Schoenholtz-Read
Sage, 2002
Buku Referensi
John C. Smart
Springer, 2012
eBooks
edited by Heather Fry, Steve Ketteridge and Stephanie Marshall
Routledge, 2009
Buku Referensi
McAvinia, Claire, author
Chandos Publishing, an imprint of Elsevie, 2016
Buku Teks