Gaya APA

ASTM, . (1997). ASTM C 311 - 97 Standard test methods for sampling and testing fly ash or natural pozzolans for use as a mineral admixture in Portland - cement concrete . : ASTM.

Gaya MLA

ASTM, . "ASTM C 311 - 97 Standard test methods for sampling and testing fly ash or natural pozzolans for use as a mineral admixture in Portland - cement concrete". : ASTM, 1997. Diorama.