Louka, Elli, author
Edward Elgar, 2011
Buku Teks
Ury, William L
Honghton Mifflin, 1985
Buku Teks
edited by Paul R. Viotti
Westview Press, 1986
Buku Teks
Khrushchov, Nikita Sergetevich, author
Foreign Languages, 1960
Buku Teks
Perkovich, George, author
Routledge, 2008
Buku Teks