Ennis, Robert H.
Critical thinking
Prentice-Hall, 1996
 Buku Teks SO
Moore, Brooke Noel
Critical thinking
McGraw-Hill, 2004
 Buku Teks SO
Ennis, Robert H.
Critical thinking
Prentice-Hall, 1996
 Buku Teks SO
Moore, Brookee Noel
Critical thinking
McGraw-Hill, 2015
 Buku Teks SO
Thinking about the future: a critique of the limits to growth
edited by H.S.D. Cole ... [et. al.]
Chatto & Windus for Sussex University Press, 1973
 Buku Teks SO