Pieper, Josef
Pantheon Books, 1955
Buku Teks
edited by Milton Fisk
Humanities Press, 1993
Buku Teks
Ross, Alf
Stevens & Sons Limited, 1958
Buku Teks
Teitel, Ruti G.
Oxford University Press, 2000
Buku Teks
Marshall, H.H.
Sweet & Maxwell Limited, 1959
Buku Teks