Gerhartz, W., & Ullmann, F. (1987). Ullmann's encyclopedia of industrial chemistry / executive editor Wolfgang Gerhartz (5th completely rev. ed.). VCH.
Chicago Style (17th ed.) CitationGerhartz, Wolfgang, and Fritz Ullmann. Ullmann's Encyclopedia of Industrial Chemistry / Executive Editor Wolfgang Gerhartz. 5th completely rev. ed. VCH, 1987.
MLA (9th ed.) CitationGerhartz, Wolfgang, and Fritz Ullmann. Ullmann's Encyclopedia of Industrial Chemistry / Executive Editor Wolfgang Gerhartz. 5th completely rev. ed. VCH, 1987.
Warning: These citations may not always be 100% accurate.