Schaefer, Richard T, author
Salemba Empat, 2012
Buku Teks
Gadjah Mada University Press, 1989
Buku Teks
Horton, Paul B., author
McGraw-Hill , 1984
Buku Teks
Horton, Paul B., author
McGraw-Hill, 1980
Buku Teks
Soerjono Soekanto, author
RajaGrafindo Persada, 2006
Buku Teks