Walsh, William F. (William Francis), 1875-1946, author
Callaghan, 1934
Buku Teks
Osborne, George Edward, author
West Publishing, 1951
Buku Referensi
Hart, Samuel L.
Philosophical Library, 1949
Buku Teks
Green, Richard, author
Academic Press, 2014
eBooks
Reisman, George, author
Jemeson Books, 1998
Buku Teks