disusun oleh Sofia Rangkuti-Hasibuan ; editor, Nung Atasana
Gramedia Pustaka Utama, 1992
Buku Teks SO
Macmillan, 1965
Buku Teks SO
Doff, Adrian
Cambridge University Press, 2010
Multimedia
Doff, Adrian
Cambridge University Press, 2010
Multimedia
Doff, Adrian
Cambridge University Press, 2010
Multimedia