James J. Nora [and others]
Lea & Febiger , 1993
Buku Teks
Barker, D.J.P.
Churchil Livingstone, 1976
Buku Teks
edited by L.G. Whitby and Walter Lutz
Churchill Livingstone, 1971
Buku Referensi
Beyers, Marjorie
Little, Brown, 1984, 1984
Buku Teks
Moynihan, Noel
Editiones Roche, 1988
Buku Teks