Niessen, S. A
Foris Publications, 1985
Buku Teks
Tuuk, H.N. van der, author
Martinus Nijhoff, 1971
Buku Teks
Siahaan, Nalom, author
Fakultas sastra Universitas Indonesia, 1975
Buku Teks
Marbun, M.A., author
Balai Pustaka, 1987
Buku Referensi
Warneck, Joh., author
Martinus Nijhoff, 1977
Buku Referensi