Morse, Janice M., author
Routledge, 2009
eBooks
Yogo Purwono, author
2017
UI - Disertasi (Membership)
Abbas Tashakkori, Charles Teddlie
SAGE Publications, 2010
Buku Teks
Sugiyono, author
Alfabeta, 2018
Buku Teks
David Parker, Miri Song, editor
Pluto Press, 2001
Buku Teks