Zimmermann, R., Wagner, G., & Finck, M. Guidelines for the use of biological monitors in air pollution control (plants). WHO Collab. Centre for Air Quality Management and Air Pollution Control, Federal Environmental Agency.
Chicago Style (17th ed.) CitationZimmermann, Ralf-Dieter, Gerhard Wagner, and Markus Finck. Guidelines for the Use of Biological Monitors in Air Pollution Control (plants). Berlin: WHO Collab. Centre for Air Quality Management and Air Pollution Control, Federal Environmental Agency.
MLA (9th ed.) CitationZimmermann, Ralf-Dieter, et al. Guidelines for the Use of Biological Monitors in Air Pollution Control (plants). WHO Collab. Centre for Air Quality Management and Air Pollution Control, Federal Environmental Agency.
Warning: These citations may not always be 100% accurate.