Ullmann, F., Elvers, B., Hawkins, S., & Schulz, G. (1992). Ullmann's encyclopedia of industrial chemistry (5th ed., completely rev.). Weinheim: VCH Verlagsgesellschaft mbH.
Παραπομπή Chicago StyleUllmann, Fritz, Barbara Elvers, Stephen Hawkins, and Gail Schulz. Ullmann's Encyclopedia of Industrial Chemistry. 5th ed., completely rev. Weinheim: VCH Verlagsgesellschaft mbH, 1992.
Παραπομπή MLAUllmann, Fritz, Barbara Elvers, Stephen Hawkins, and Gail Schulz. Ullmann's Encyclopedia of Industrial Chemistry. 5th ed., completely rev. Weinheim: VCH Verlagsgesellschaft mbH, 1992.
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