Rattenbury, Harold B.
Frederick Muller, [date of publication not identified]
Buku Teks
Clark, Sydney
Dodd, Mead & Company, 1957
Buku Teks
Bird, Isabella L
Oxford University Press, 1967
Buku Teks
Sujono, author
Dian Publishing, 2009
Buku Teks
Vandromme, Pol
Heideland,, 1981.
Buku Referensi