Tregidgo, Philip Sillince
Longman, 1979
Buku Teks
Makkink, H.J., author
Nijgh and Van Ditmar, 1951
Buku Teks
Murphy, Raymond, author
Cambridge University Press, 1998
Buku Teks
Hewings, Martin, author
Cambridge University Press, 2005
Buku Teks
Dhanny R. Cyssco, author
Puspa Swara, 2004
Buku Teks