McFarlands & Company, 1983
Buku Referensi
Jensen, Merrill
Kriger, 1979
Buku Teks
Kelly, Alfred H.
W.W. Norton, 1955
Buku Teks
Mitchell, Broadus
Oxford University Press, 1964
Buku Teks
edited by Carl J. Friedrich, Robert G. McCloskey
The Liberal Arts Press, 1954
Buku Teks