Melvil Deway. (1989). Deway decimal classification and relative index V 4: Relative index (20.). Forest press.
Chicago Edition CitationMelvil Deway. Deway Decimal Classification and Relative Index V 4: Relative Index. 20. Forest press, 1989.
MLA Edition CitationMelvil Deway. Deway Decimal Classification and Relative Index V 4: Relative Index. 20. Forest press, 1989.
Warning: These citations may not always be 100% accurate.