Douglas, William O.
Princeton University Press , 1960
Buku Teks
Maisel, Albert Q.
Thomas Nelson , 1957
Buku Teks
Lerner, Max
Simon and Schuster, 1957
Buku Teks
Brzenzunski, Zbigniew
Greenwood Press, 1970
Buku Teks
Commager, Henry Steele, selector
A Mentor Book, 1948
Buku Teks