Não informado. (1971). Concrete abstracts. American Concrete Institute.
Chicagoスタイル(17版)引用形式Não informado. Concrete Abstracts. Detroit, Mich: American Concrete Institute, 1971.
MLA(8版)引用形式Não informado. Concrete Abstracts. American Concrete Institute, 1971.
警告: この引用は必ずしも正確ではありません.