Gimlette, John D.
Oxford University Press, 1971
Buku Referensi
Firth, Raymond
Routledge & Kegan Paul, 1971
Buku Teks
Endicott, Kirk Michael
Clarendon Press, 1970
Buku Teks SO
Sadka, Emily
University of Malaya Press, 1968
Buku Teks SO
Wheatley, Paul
University Of Malaya Press, 1961
Buku Teks SO