Philippines (Republic). Department of Labor. Department of labor manual. [s.n.
Citazione stile Chigago Style (17a edizione)Philippines (Republic). Department of Labor. Department of Labor Manual. Manila: [s.n.
Citatione MLA (9a ed.)Philippines (Republic). Department of Labor. Department of Labor Manual. [s.n.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.