National Statistical Information Center. (2006). 2006 Philippine statistical yearbook. The National Statistical Information Center.
Chicago-referens (17:e uppl.)National Statistical Information Center. 2006 Philippine Statistical Yearbook. Makati City: The National Statistical Information Center, 2006.
MLA-referens (9:e uppl.)National Statistical Information Center. 2006 Philippine Statistical Yearbook. The National Statistical Information Center, 2006.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.