Brim, John A.
Holt, Rinehart and Winston, 1974
Buku Teks
Blaxter, Loraine, author
Open University Press , 1996
Buku Teks
McNeill, Patrick, author
Routledge, 1999
Buku Teks
Eggi Sudjana, author
Rajawali, 2008
Buku Teks
Ali Audah, author
Pustaka Firdaus, 1999
Buku Teks