Resnikoff, H.L.
Holt, Rinehart and Winston, 1973
Buku Teks
Lipson, Leslie, author
Vakils, Feffer and Simons Private, 1964
Buku Teks
Ferguson, Wallace K., author
Sir Isaac Pitman & Sons, [date of publication not identified]
Buku Teks
Runciman, Steven
Meridian Books, 1959
Buku Teks
Lerner, Max, author
Simon and Schuster, 1957
Buku Teks