Liberation, 1964
Buku Teks
Erlangga Ibrahim, author
Gramedia Pustaka Utama, 2016
Buku Teks
Council for Research in Values and Philosophy, 2006
Buku Teks
U.S. Government Printin, 1967
Buku Teks
Brand, Mona, author
Foreign Languages Publishing House, 1958.
Buku Teks