Agoncillo, Teodoro A.
R. P. Garcia Pub. Co., 1965
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Aron, Raymond, author
Basic Books, 1965
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Sato, Tadao, 1930-
Harper & Row, 1987
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Schlabbach, Jurgen, author
Institution of Engineering and Technology, 2008
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Nau, Robert H., author
Ronald Press, 1962
Buku Teks