Rich, C L.(1977). Is Random Digit Dialing Really Necessary?Journal of Marketing Research, 14(3), 300. doi:10.2307/3150767
MLA CitationRich, Clyde L. "Is Random Digit Dialing Really Necessary?" Journal of Marketing Research, 14.3 ( 1977 ): 300.
Remember to check citations for accuracy before including them in your work.