Hoffer, J. R. (1961). Information retrieval in social welfare: Experiences with an edge-notched information retrieval system. National Conference on Social Welfare.
Chicago-viite (17. p.)Hoffer, Joe Ralph. Information Retrieval in Social Welfare: Experiences with an Edge-notched Information Retrieval System. Columbus, Ohio: National Conference on Social Welfare, 1961.
MLA-viite (9. p.)Hoffer, Joe Ralph. Information Retrieval in Social Welfare: Experiences with an Edge-notched Information Retrieval System. National Conference on Social Welfare, 1961.
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