Lua APA (7ú heag.)

Nakagawa, K., Yamada, K., Tsurue, T., Takeda, S., Ishizaki, K., Quilao, T., . . . Vinluan, F. Characterization of coal ash. Philippine Engineering Journal.

Lua i Stíl Chicago (17ú heag.)

Nakagawa, K., et al. "Characterization of Coal Ash." Philippine Engineering Journal .

Lua MLA (9ú heag.)

Nakagawa, K., et al. "Characterization of Coal Ash." Philippine Engineering Journal, .

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