Schwarzenberger, Georg, author
Thirty Bedford Square, 1943
Buku Teks
Tromly, Benjamin, 1976-, author
Cambridge University Press, 2014
Buku Teks
Hikhma Rizkita Putri, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2017
UI - Makalah dan Kertas Kerja
Cousins, Albert N., 1919-, author
John Wiley & Sons, 1979
Buku Teks
Barnes, Harry Elmer, author
Prentice-Hall, 1950
Buku Teks