a key to their use,
compiled by Marian C. Manley, branch librarian of the Newark business branch, under the direction of Beatrice Winser.
Newark Public Library. Business Branch., Winser, B., Manley, M. C. (1934). Business directories: a key to their use. Newark, N.J.: The Public library.
Newark Public Library. Business Branch, Beatrice Winser, and Marian C Manley. Business Directories: a Key to Their Use. Newark, N.J.: The Public library, 1934.
Warning: These citations may not always be complete (especially for serials).