Arnold, Pauline
Holiday House , 1963
Buku Teks
edited by G.W.A. Dummer, F.P. Thompson and J. Mackenzie Robertson
Pergamon Press, 1971
Buku Teks
Levin, Howard S., author
John Wiley & Sons, 1956
Buku Teks
Merkulov, A.
Foreign Languages Publishing House,
Buku Teks
Nof, Shimon Y., 1946-
Springer, 2009
Buku Referensi