Reid, Jasper
Springer, 2012
eBooks
Cook, John W.
Cambridge University Press , 1994
Buku Teks
Vaske, Martin O.
McGraw-Hill, 1963
Buku Teks
edited by Jaegwon Kim
Blackwell Publishing, 1999
Buku Teks
Koons, Robert C, author
Malden, MA : Wiley-Blackwell, 2015
Buku Teks