Priest, Graham, author
Cambridge University Press, 2008
eBooks
Copi, Irving M., author
Macmillan, 1961
Buku Teks
Copi, Irving M., author
Macmillan, 1972
Buku Teks
Tidman, Paul, author
Wadsworth, 1999
Buku Teks
Marcovitz, Alan B., author
McGraw-Hill, 2002
Buku Teks