Wallace, Walter L.
Aldine Publishing Company, 1971
Buku Teks
Abbot, Pamela
Routledge, 1997
Buku Teks
Mates, Benson, author
Oxford University Press, 1965
Buku Teks
edited by Dov M. Gabbay and John Woods
Elsevier, 2004
Buku Referensi
Hurley, Patrick J., 1883-1963, author
Wadsworth, 1984
Buku Teks