Philippines. National Historical Institute. (2002). The Flag and heraldic code of the Philippines illustrated: Rules and regulations implementing Republic Act No. 8491. National Historical Institute.
Chicago-referens (17:e uppl.)Philippines. National Historical Institute. The Flag and Heraldic Code of the Philippines Illustrated: Rules and Regulations Implementing Republic Act No. 8491. Manila: National Historical Institute, 2002.
MLA-referens (9:e uppl.)Philippines. National Historical Institute. The Flag and Heraldic Code of the Philippines Illustrated: Rules and Regulations Implementing Republic Act No. 8491. National Historical Institute, 2002.
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