Browning, D.C.
J.M. Dent & Sons, 1951
Buku Referensi
Smith, William George, compiler
Clarendon Press, 1952
Buku Referensi
Bloomsbury, 1990
Buku Referensi
edited by Angela Partington
Oxford University Press, 1993
Buku Referensi
Eigen, Lewis D.
Macmillan, 1993
Buku Referensi