Shelly, Judith Allen
InterVarsity Press, 1982
Buku Teks SO
Baker, Colin
Multilingual Matters Ltd., 1995
Buku Referensi
Ward, Tara
Arcturus Publishing Ltd, 2008
Buku Teks
Rorden, Judith Waring
W.B. Saunders Company, 1987
Buku Teks
Baker, Colin
Multilingual Matters Ltd, 1995
Buku Teks