Robert, A. Hood
Mouton, 1965
Buku Teks
Keats, John, author
Everyman's Library, 1999
Buku Teks
Kenyon, John Samuel, author
Merriam-Webster ; G. & C. Merriam Co., 1953
Buku Referensi
editor, William Morris
Houghton Miffiln, 1976
Buku Referensi
Watt, Homer A., author
Scott, Foresman, 1932
Buku Teks