Kalijarvi, Thorsten V.
Thomas Y. Crowell, 1954
Buku Teks
John Baylis, Steve Smith, Patricia Owens.
Oxford University Press, 2014
Buku Teks
Schuman, Frederick L.
McGraw-Hill, 1958
Buku Teks
Friedmann, Wolfgang, 1907-1972
Macmillan, 1951
Buku Teks
Alan Cafruny, Leila Simona Talani, Gonzalo Pozo Martin, editors.
Palgrave Macmillan, 2016
Buku Teks