Allen, Shirley Walter
McGraw-Hill, 1959
Buku Teks
Burke, Mary A.
Gower , 2001
Buku Teks
Catt, Helena
Routledge , 1999
Buku Teks
Le Boutillier, Cornelia Geer
Columbia University Press, 1950
Buku Teks
Pearce, David William, 1941-
Harvester Wheatsheaf, 1990
Buku Teks