Widick, B.J.
Houghton Mifflin , 1964
Buku Teks
Starratt, Edith E.
Prentice-Hall, 1966
Buku Teks
Miller, Roger LeRoy, author
Thomson West, 2007
Buku Teks
Lattimore, Owen, 1900-, author
Claremont Colleges, 1943
Buku Teks
Sage Publications, 1997
Buku Teks