Gras, Norman Scott Brien, author
F.S. Crofts, 1946
Buku Teks
Palmer, Robert Roswell, 1909-2002, author
Princeton University Press, 1964
Buku Teks
Hollister, C. Warren, author
John Wiley & Sons, 1968
Buku Teks
Buku Teks
Black, C.E., author
Alfred A. Knopf, 1966
Buku Teks