Michael Wilford, editor
LLP, 2003
Buku Teks
LLoyd's of London Press LTD, 1995
Buku Teks
Kimball, John D.
LLoyd's of London Press LTD, 1993
Buku Teks
by Aleksey Maksimovich Gor`kiy; translated by Margaret Wettlin
Foreign Languages Publishing House, [date of publication not identified]
Buku Teks
Coimbra Group, 1994
Buku Referensi