Palmer, Marilyn
English Heritage, 2012
Buku Teks
Palmer, Marilyn
Routledge, 1998
Buku Teks SO
edited by Paul K. Edwards
Blackwell , 1995
Buku Teks
Pollard, Sidney
Harvard University Press, 1965
Buku Teks
Lenin, Vladimir I.
Foreign Languages Publishing House , [date of publication not identified]
Buku Teks