Cambridge University Press, 2010
eBooks
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2007
UI - Skripsi Membership
Swan, Michael, author
Longmans Green, 1969
Buku Teks
Woolf, Judith, author
Cambridge University Press, 1991
Buku Teks
Tanner, Tony, author
Longman Group, 1979
Buku Teks