McGarry, Daniel D., author
Littlefield, Adams, 1968
Buku Teks
Offices of the Royal Historical society, 1963
Buku Referensi
Ellis, Janice Rider, author
Lippincott , 1996
Buku Teks
Wilgus, A. Curtis, author
Barner & Noble, 1963
Buku Teks
Weintraub, Max, author
Regents, 1960
Buku Teks