Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2007
UI - Skripsi (Membership)
Woolf, Judith, author
Cambridge University Press, 1991
Buku Teks
Swan, Michael, author
Longmans Green, 1969
Buku Teks
Tanner, Tony, author
Profile Books, 1981
Buku Teks
Tanner, Tony, author
Longman Group, 1979
Buku Teks