Maidment, Frederick
Prentice-Hall, 1999
Buku Teks
Maidment, Frederick
Prentice-Hall, 2000
Buku Teks
Bradley, F.H.
Clarendon Press, 1959
Buku Teks
edited by Hugh LaFollette and Ingmar Persson
Wiley Blackwell, 2013
Buku Teks
selected and edited by Wilfrid Sellars and John Hospers
Appleton-Century-Crofts, 1952
Buku Teks