ARCO The 1st Name in College Guides
Macmillan General Reference, 1994
Buku Referensi
Porter, Hal, 1911-1984, author
Rigby, 1971
Buku Teks
Wright, Judith, author
Lansdowne Press, 1963
Buku Teks
Symons, Julian, author
Arthur Barker, 1951
Buku Teks
Fielding, K.J., author
Longman, Green, 1953
Buku Teks