Sarton, George
Henry Schuman, 1948
Buku Teks
Brandes, Joseph
University of Pittsburgh Press, 1962
Buku Teks
Walinsky, Louis J.
The Twentieth Century Fund, 1962
Buku Teks
Burnell, Peter J.
Westview Press, 1986
Buku Teks
Mishan, E J
Penguin book, 967
Buku Teks