Wasserman, P. (1976). Encyclopedia of business information sources: A detailed listing of primary subiects of interest to managerial persinne, with a record of sourcebooks, periodicals, organizations, directories, handbooks, bibliographies, and other sources of information on each topic (Third edition.). Detroit: Gale Research Company.

Wasserman, Paul. Encyclopedia of Business Information Sources: A Detailed Listing of Primary Subiects of Interest to Managerial Persinne, With a Record of Sourcebooks, Periodicals, Organizations, Directories, Handbooks, Bibliographies, and Other Sources of Information On Each Topic. Third edition. Detroit: Gale Research Company, 1976.

Wasserman, Paul. Encyclopedia of Business Information Sources: A Detailed Listing of Primary Subiects of Interest to Managerial Persinne, With a Record of Sourcebooks, Periodicals, Organizations, Directories, Handbooks, Bibliographies, and Other Sources of Information On Each Topic. Third edition. Detroit: Gale Research Company, 1976.