Bartz, Albert E
Macmillan, 1981
Buku Teks
Downie, N. M.
Harper & Row, Pub., 1974
Buku Teks
Li, Jerome C.R., author
Edwards Brothers, 1964
Buku Teks
Bryant, Edward C., author
McGraw-Hill Book , 1966
Buku Teks
Bennett, Jeffrey O.
Pearson - Addison Wesley, 2009
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