Makkink, H.J.
Nijgh and Van Ditmar, 1951
Buku Teks SO
Murphy, Raymond
Cambridge University Press, 1998
Buku Teks SO
Hewings, Martin
Cambridge University Press, 2005
Buku Teks SO
Dhanny R. Cyssco
Puspa Swara, 2004
Buku Teks SO
Drummond, Gordon
Essex Longman, 1972
Buku Teks SO