Downer, Alan, author
University of Minnesota Press, 1961
Buku Teks
Sitanggang, Saut Raja Hamonangan, author
Departemen Pendidikan dan Kebudayaan, Pusat Pembinaan dan Pengembangan Bahasa, 1995
Buku Teks
edited by Alan S. Downer
University of Chicago Press, 1965
Buku Teks
Lamm, Martin
Norwood Editions,, 1977
Buku Teks
Wisnu Surya Pratama, author
Universitas Indonesia, 2002
UI - Skripsi (Membership)