Sapalo, I. S. Philippine law on patents, trademarks and copyright (Background reading material on intellectual property, Philippine national supplement).
Chicago-referens (17:e uppl.)Sapalo, Ignacio S. Philippine Law on Patents, Trademarks and Copyright (Background Reading Material on Intellectual Property, Philippine National Supplement).
MLA-referens (9:e uppl.)Sapalo, Ignacio S. Philippine Law on Patents, Trademarks and Copyright (Background Reading Material on Intellectual Property, Philippine National Supplement).
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