Cecil, David, author
Constable, 1949
Buku Teks
Johns, Anthony Hearly, author
Australian National University Press , 1979
Buku Teks
edited by Martin E. Persson
Emerald, 2016
eBooks
edited by Gareth Williams, Martin Kenyon and Lynn Williams
Overseas Student Trust, 1987
Buku Referensi
Pirie, David B.
Routledge, 1985
Buku Teks