Jackson, J. Hampden
Hougton Mifflin Company, 1956
Buku Teks
Scully, Vincent, Jr., 1920-2017, author
G. Braziller, 1974
Buku Teks
Barraclough, Geoffrey, 1908-1984
Penguin Books, 1967
Buku Teks
Fratelli Fabri , 1968
Buku Referensi
Haftman, Werner, author
Frederick A. Praeger, Pub., 1960
Buku Referensi