APA Style

(ACI), A, C, I. (1991). Standard practice for selecting proportions for normal, heavyweight, and mass concrete (ACI 211-1-91) (1). Washington: Prentice-Hall Internasional.

MLA Style

(ACI), AMERICAN, CONCRETE, INSTITUTE. "Standard practice for selecting proportions for normal, heavyweight, and mass concrete (ACI 211-1-91)". 1 Washington: Prentice-Hall Internasional, 1991. Text.