Del Valle, C. A. (1989). A Total systems study of Lucban Hats and Handicrafts. UP College of Engineering.
Citace podle Chicago (17th ed.)Del Valle, Caryl A. A Total Systems Study of Lucban Hats and Handicrafts. Quezon City: UP College of Engineering, 1989.
Citace podle MLA (9th ed.)Del Valle, Caryl A. A Total Systems Study of Lucban Hats and Handicrafts. UP College of Engineering, 1989.
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