Ruse, Michael, author
Cambridge University Press, 2012
Buku Teks
Akaruese, Lucky, author
Xlibris Corporation, 2012
Buku Teks
Eckhardt, Robert B., author
McGraw-Hill, 1979
Buku Teks
edited by Lori D. Hager
Routledge, 1997
Buku Teks
Routledge, 1997
Buku Teks