Douglas, Dan, author
Cambridge University Press, 2000
Buku Teks
Brian Paltridge, editor; Sue Starfield, editor
Wiley-Blackwell, 2013
Buku Teks
disusun oleh Sofia Rangkuti-Hasibuan ; editor, Nung Atasana
Gramedia Pustaka Utama, 1992
Buku Teks
Hasibuan, Sofia, author
Gramedia, 1986
Buku Teks
Rangkuti-Hasibuan, Sofia, author
Gramedia, 1986
Buku Teks