(1972). Proposed road construction and /or improvement for the Bicol region. [s.n.].
Citazione stile Chigago Style (17a edizione)Proposed Road Construction and /or Improvement for the Bicol Region. [Manila]: [s.n.], 1972.
Citatione MLA (9a ed.)Proposed Road Construction and /or Improvement for the Bicol Region. [s.n.], 1972.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.