APA način citiranja (7. izdanje)
Klöpffer, W., & Grahl, B. (2014). Life cycle assessment: A guide to best practice. Wiley-VCH.
Čikaški stil citiranja (17. izdanje)
Klöpffer, Walter, i Birgit Grahl. Life Cycle Assessment: A Guide to Best Practice. Weinheim an der Bergstrasse, Germany: Wiley-VCH, 2014.
MLA način citiranja (9. izdanje)
Klöpffer, Walter, i Birgit Grahl. Life Cycle Assessment: A Guide to Best Practice. Wiley-VCH, 2014.
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