Document Rizal province: archaeological survey: Lake district vol. 1-2, Otley Beyer Unit ID: Bey 32-1-2
Document Rizal province: archaeological survey: Lake district vol's 3-5, Otley Beyer Unit ID: Bey 32-3-5
Document Rizal province: archaeological survey: Lake district vol's 6-7, Otley Beyer Unit ID: Bey 32-6-7