Koolma, A., author
UI-Press, 1988
Buku Referensi
Siagian, Sondang P., author
Bumi Aksara, 2004
Buku Teks
Bechtell, Michele L.
Halirang, 1997
Buku Teks
Parkinson, C. Northcote (Cyril Northcote), 1909-1993, author
Pustaka Binaman Pressindo, 1984
Buku Teks
Lateiner, Alfred R
Akasara Baru, 1980
Buku Teks