Pollard, Sidney, author
Harvard University Press, 1965
Buku Teks
Blaufarb, Rafe, author
Oxford University Press, 2016
eBooks
Toynbee, Arnold J., author
The Beacon Press , 1961
Buku Teks
Zasloff, Joseph Jermiah, author
Verlagshaus Amerikanischen, 1952
Buku Teks
Moodie, Graeme C., author
Crowell, 1971
Buku Teks