(1960). Bicol region. [s.n.].
Chicago Style (17th ed.) CitationBicol Region. [Manila]: [s.n.], 1960.
MLA引文Bicol Region. [s.n.], 1960.
警告：這些引文格式不一定是100％准確.
APA引文
(1960). Bicol region. [s.n.].
Chicago Style (17th ed.) CitationBicol Region. [Manila]: [s.n.], 1960.
MLA引文Bicol Region. [s.n.], 1960.