Willcox, William B., author
D.C. Heath and Company, 1988
Buku Referensi
Willcocx, William B.
D.C. Health and Company, 1988
Buku Teks
Cannadine, David
Papermac, 1996
Buku Teks
Plumb, J.H. (John Harold), 1911-, author
Penguin Books, 1963
Buku Teks
Plumb, J.H. (John Harold), 1911-, author
Penguin Books , 1951
Buku Teks