May, Rollo, 1909-, author
W.W. Norton, 1953
Buku Teks
May, Rollo, 1909-, author
W.W. Norton, 2009
Buku Teks
May, Rollo, 1909-, author
Dell Publishing Co., Inc., 1953
Buku Teks
Rudan, Gina Amaro, author
Simon and Schuster, 2011
Buku Teks
Scott, Steven K.
Think, 2006
Buku Teks SO