Howes, J. E., Pesut, R. N., & Foster, J. F. (1974). Final report on interlaboratory cooperative study of the precision and accuracy of the determination of the relative density of black smoke (Ringelmann method) using ASTM method D 3211-73 T J. E. Howes, Jr., R. N. Pesut, and J. F. Foster, Battelle Memorial Institute. American Society for Testing and Materials.
Chicago Style (17th ed.) CitationHowes, James E., R. N. Pesut, and John F. Foster. Final Report on Interlaboratory Cooperative Study of the Precision and Accuracy of the Determination of the Relative Density of Black Smoke (Ringelmann Method) Using ASTM Method D 3211-73 T J. E. Howes, Jr., R. N. Pesut, and J. F. Foster, Battelle Memorial Institute. Philadelphia, Pa.: American Society for Testing and Materials, 1974.
MLA (9th ed.) CitationHowes, James E., et al. Final Report on Interlaboratory Cooperative Study of the Precision and Accuracy of the Determination of the Relative Density of Black Smoke (Ringelmann Method) Using ASTM Method D 3211-73 T J. E. Howes, Jr., R. N. Pesut, and J. F. Foster, Battelle Memorial Institute. American Society for Testing and Materials, 1974.