APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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