Copi, Irving M., author
Macmillan, 1961
Buku Teks
Copi, Irving M., author
Prentice-Hall, 1995
Buku Teks
Bittle, Celestine N., author
The Bruce Publishing, 1950
Buku Teks
Nolt, John, author
McGraw-Hill, 2011
Buku Teks
Pratt, Scott L
Wiley, 2015
Buku Teks