Giegerich, Heinz J., author
Cambridge University Press, 1992
eBooks
Hudson, John, author
Longman, 1996
Buku Teks
O`Connor, J.F., 1931-, author
Hants Gower, 1990
Buku Teks
disusun oleh Sofia Rangkuti-Hasibuan ; editor, Nung Atasana
Gramedia Pustaka Utama, 1992
Buku Teks
Hanbury, Harold Grenville, author
Oxford University Press, 1960
Buku Teks