Vallier, Ivan, author
Prentice-Hall, 1970
Buku Teks
edited by John P. Hogan and George F. McLean
Council for Research in Values and Philosophy, 2005.
Buku Teks
Praetz, Helen Margaret
Melbourne Melbourne University Press , 1980
Buku Teks
Kanisius, 2016
Buku Teks
Yan, Kejia, author
Wu zhou chuan bo chu ban she, 2004
Buku Teks