APA (7th ed.) Citation

Ostrea, E. The Surigao iron ore and its metallurgical treatment. Philippine Engineering Journal.

Chicago Style (17th ed.) Citation

Ostrea, Enrique. "The Surigao Iron Ore and Its Metallurgical Treatment." Philippine Engineering Journal .

MLA (9th ed.) Citation

Ostrea, Enrique. "The Surigao Iron Ore and Its Metallurgical Treatment." Philippine Engineering Journal, .

Warning: These citations may not always be 100% accurate.