Artikel Jurnal
editor by Celeste West; Elizabeth Katz
Booklegger Press , 1972
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