Hunt, Percival
Fifteenth century England / Percival Hunt
University of Pittsburgh Press, 1962
 Buku Teks
Stauffer, Donald Alfred, author
The art of biography in eighteenth century England
Princeton University Press, 1941
 Buku Teks
Doob, Leonard William, 1909-, author
Public opinion and propaganda
The Cresset Press, 1948
 Buku Teks
Gallup, George
A Guide To Public Opinion Polls
Princeton University press, 1948
 Buku Teks
Reader in public opinion and communication
The Free Press, 1966
 Buku Teks
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