Situmorang, Sitor, 1923-2014, author
Pustaka Sinar Harapan, 1993
Buku Teks
1964
Buku Teks
Freeland, Cynthia A., author
Oxford University Press, 2001
Buku Teks
editor, Maria Leach
Funk & Wagnalls Co., 1949
Buku Referensi
Brohier, R.L.
Lake House Investments, 1971
Buku Teks