Palmer, Marilyn
English Heritage, 2012
Buku Teks
edited by Robert U. Ayres and Leslie W. Ayres
Edward Elgar Publishing, 2001
Buku Referensi
Freeman, Harry M.
McGraw-Hill, 1971
Buku Referensi
Freeman, Harry M.
McGraw-Hill, [1995;1995, 1995]
Buku Referensi
edited by Albert Parker
McGraw-Hill, 1978
Buku Referensi