Citazione Stile APA (7a Edizione)

Ejercito, T. A., & Lewis, H. R. (1967). Washability characteristics of some Philippine coals. [Bureau of Mines].

Citazione stile Chigago Style (17a edizione)

Ejercito, Telesforo A., e Helen R. Lewis. Washability Characteristics of Some Philippine Coals. Manila: [Bureau of Mines], 1967.

Citatione MLA (9a ed.)

Ejercito, Telesforo A., e Helen R. Lewis. Washability Characteristics of Some Philippine Coals. [Bureau of Mines], 1967.