APA aipamena

Del Prado, M. G. "Significant events and dates of Bikol history". s.n.

Chicago Style aipamena

Del Prado, Mariano Goyena. "Significant Events and Dates of Bikol History". s.l: s.n.

MLA aipamena

Del Prado, Mariano Goyena. "Significant Events and Dates of Bikol History". s.n.