Bicol River Basic Council. (1975). Project feasibility study of Libmanan: Cabusao integrated development. The Council.
Chicago-viite (17. p.)Bicol River Basic Council. Project Feasibility Study of Libmanan: Cabusao Integrated Development. Camarines Sur: The Council, 1975.
MLA-viite (9. p.)Bicol River Basic Council. Project Feasibility Study of Libmanan: Cabusao Integrated Development. The Council, 1975.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.