Lembaga Penelitian IKIP Yogyakarta, {s.a}
Majalah, Jurnal, Buletin
Taty A. Nurdjaman
ITB Press, [date of publication not identified]
Buku Referensi
Husein Umar, author
Rajawali, 2009
Buku Teks
Husein Umar, author
Rajawali, 2013
Buku Teks
Husein Umar, author
Radja Grafindo Persada, 2005
Buku Teks