Todd, Lewis Paul, author
Harcourt, Brace & World, 1961
Buku Teks
Todd, Lewis Paul, author
Harcourt Brace Jovannovich, 1972
Buku Teks
Alden, John Richard, author
Harper & Row Publishers, 1963
Buku Teks
Diggins, John Patrick
W.W Norton, 1992
Buku Teks
Patrick, John
Macmillan Publishing Company, 1984
Buku Teks