McKenzie, Richard B., author
Springer, 2012
eBooks
Wattenberg, Ben J
Doubleday, 1974
Buku Teks
Clawson, Marion, author
John Hopkins, 1972
Buku Teks
Manglapus, Raul S., author
Solidaridad Publishing House, 1967
Buku Teks
Reuss, Henry S., author
McGraw-Hill, 1964
Buku Teks