Dwight, Herbert Bristol
"New York: McGraw-Hill, 1941",
Buku Teks
edited by Milton Abramowitz, Irene A. Stegun
U.S. Government Printing Office, 1967
Buku Referensi
Luke, Yudell L., author
Academic Press, 1977
Buku Teks
Johnson, David E., author
Ronald Press, 1965
Buku Teks
Thompson, William J., author
Wiley , 1997
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