Jay, Douglas, author
Faber & Faber, 1946
Buku Teks
Ayer, A. J. (Alfred Jules), 1910-1989, author
Macmillan, 1963
Buku Teks
Mayer, Frederick, author
American Book Company, 1950
Buku Teks
Preiss, Julian, author
Routledge, 2013
Buku Teks
Bastiat, Frederick
D. Van Nostrand , 1964
Buku Klasik