Hasibuan, Sofia
English for specific purposes : economics
Gramedia, 1986
 Buku Teks
Rangkuti-Hasibuan, Sofia
English for specific purposes : medicine
Gramedia, 1986
 Buku Teks
The handbook of English for specific purposes
Brian Paltridge, editor; Sue Starfield, editor
Wiley-Blackwell, 2013
 Buku Teks
Community analysis in english for specific purposes (ESP)
 Artikel Jurnal
Hutchinson, Tom, 1930-
English for specific purposes : a learning-centred approach / Tom Hutchinson and Alan Waters
Cambridge University Press , 1993
 Buku Teks