Wojciechowski, Jerzy A., author
Council for research in values and philosophy, [Date of publication not identified]
Buku Teks
edited by Ajith H. Perera, C. Ashton Drew and Chris J. Johnson
Springer, 2012
eBooks
Starr, Cecie, author
Brooks/Cole , 2001
Buku Teks
Newman, Edward I., author
Blackwell Science, 1993
Buku Teks
Brewer, Richard, author
Saunders College Publishing, 1994
Buku Teks