Ndolu, Freddy, author
IndonesiaSatu Publisher, 2008
Buku Teks
Ndolu, Freddy, author
IndonesiaSatu Publisher, 2009
Buku Teks
Ndolu, Freddy, author
IndonesiaSatu Publisher, 2009
Buku Teks
K.H. Abdurahman Wahid
Kompas, 2007
Buku Teks
Easton, David, author
Prentice-Hall, 1965
Buku Teks