Mohammad Nazir
Ghalia Indonesia, 1999
Buku Teks
Bambang Prasetyo
[publisher not identified], [date of publication not identified]
Buku Teks
edited by Robert T. Holt
Free Press, 1970
Buku Teks
Suharsimi Arikunto
Rineka Cipta, 1993
Buku Teks
Bambang Prasetyo
RajaGrafindo Persada, 2005
Buku Teks