Bryant, Antony, author
Oxford University Press, 2017
eBooks
Abd. Syukur Ibrahim, author
Usaha Nasional, 1985
Buku Teks
Strauss, Anselm L., author
Sage, 1990.
Buku Teks
Strauss, Anselm L., author
Sage, 1998
Buku Teks
Charmaz, Kathy, author
Sage , 2014
Buku Teks