Philippines. Department of Tourism. Region II. (2006). Cagayan Valley Region2006 tourism situationer. Department of Tourism. Regional Office.
Chicago-referens (17:e uppl.)Philippines. Department of Tourism. Region II. Cagayan Valley Region2006 Tourism Situationer. Tuguegarao, Cagayan: Department of Tourism. Regional Office, 2006.
MLA-referens (9:e uppl.)Philippines. Department of Tourism. Region II. Cagayan Valley Region2006 Tourism Situationer. Department of Tourism. Regional Office, 2006.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.