Pamela Paul, edited
New York Henry Holt and Company, 2014
Buku Teks
Wilson, Edmund, 1895-1972, author
Charles Scribner's Sons, 1953
Koleksi Publik
Williams, Harold Herbert, author
Sidgwick & Jackson, 1918
Buku Teks
edited by Maynard Mack
Prentice-Hall, 1953
Buku Teks
Artikel Jurnal