Beer, Samuel H.
Clarendon Press, 1957
Buku Teks
Goeltom, Miranda S., author
[publisher not identified], 2007
Buku Teks
Tew, Brian
Melbourne Univ. Press , 1956
Buku Teks
Campion, H.
Oxford University Press, 1939
Buku Teks
Beer, Samuel H.
Faber and Faber, 1971
Buku Teks