Portland Cement Association & American Concrete Institute. (1981). Certification of concrete field testing technicians, grade I. Portland Cement Association.
Chicago Style (17th ed.) CitationPortland Cement Association and American Concrete Institute. Certification of Concrete Field Testing Technicians, Grade I. Skokie, Ill.: Portland Cement Association, 1981.
MLA (9th ed.) CitationPortland Cement Association and American Concrete Institute. Certification of Concrete Field Testing Technicians, Grade I. Portland Cement Association, 1981.
Warning: These citations may not always be 100% accurate.