Andres, D. (1950). Comments on the Bell Report as it relates to the mining industry, and recommendations. [s.n.].
Citazione stile Chigago Style (17a edizione)Andres, Demetrio. Comments on the Bell Report as It Relates to the Mining Industry, and Recommendations. Manila: [s.n.], 1950.
Citatione MLA (9a ed.)Andres, Demetrio. Comments on the Bell Report as It Relates to the Mining Industry, and Recommendations. [s.n.], 1950.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.