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Buku Teks
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Pedro M. Arezes, Joao S. Baptista, Monica P. Barroso, Paula Carneiro, Patricio Cordeiro, Nelson Costa, Rui B. Melo, A. Sergio Miguel, Goncalo Perestrelo, editors
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eBooks
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M&E Handbook Series, 1995
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Goetsch, David L., author
Prentice-Hall, 2000
Buku Teks