Vinogradoff, Paul, 1854-1925, author
Oxford University Press, 1959
Buku Teks
Russell, Bertrand, 1872-1970, author
Routledge, 2001
Buku Teks
Nickel, James W., author
Blackwell , 2007
Buku Teks
Perrine, Laurence
Harcourt Brace Javanovich, 1984
Buku Teks
Montgomery, John C., author
Oxford University Press, 2016
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