Artikel Jurnal
Wu, Ching-Tzu, author
Foreign Language Publishing House, 1957
Buku Teks
edited by Mieke Ball
California Stanford University Press, 1999
Buku Teks
Waddell, Helen, 1889-1965, author
Penguin Books, 1954
Buku Teks
Morgenthau, Hans J., author
The University of Chicago Press, 1962
Buku Teks