Crepps, R. B., & Mills, R. E. (1923). Ball test applied to cement mortar and concrete. Bulletin / Engineering Experiment Station <West Lafayette, Ind.> 12.
Citação norma ChicagoCrepps, R. B., and R. E. Mills. "Ball Test Applied to Cement Mortar and Concrete." Bulletin / Engineering Experiment Station <West Lafayette, Ind.> 12 1923.
Citação norma MLACrepps, R. B., and R. E. Mills. "Ball Test Applied to Cement Mortar and Concrete." Bulletin / Engineering Experiment Station <West Lafayette, Ind.> 12 1923.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.