Edward Arnold, 1978
Buku Teks
Robert M. Hutchins, Mortimer J. Adler, editors in chief
Encyclopaedia Britannica, Inc., 1963
Buku Referensi
Pirie, David B., author
Roetledge, 1985
Buku Referensi
edited by Norman Page
Macmillan, 1984
Buku Teks
Macaulay, Lord, author
Longmans, 1874
Koleksi Publik