Peters, Michael A., author
Sense, 2012
eBooks
edited by Ralph B. Winn
Littlefield, Adams, 1963
Buku Teks
Robinson, Joan, author
C.A. Watts, 1962
Buku Teks
Schneider, Herbert W., author
Columbia University Press, 1947
Buku Teks
Susana Nuccetelli, Ofelia Schutte, Otavio Bueno
Wiley, 2013
Buku Teks