Cita APA (7th ed.)

Klopffer, W., & Grahl, B. (2014). Life cycle assessment (LCA): A guide to best practice. Wiley-VCH Verlag GmbH & Co. KGaA.

Cita Chicago (17th ed.)

Klopffer, Walter, i Birgit Grahl. Life Cycle Assessment (LCA): A Guide to Best Practice. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2014.

Cita MLA (9th ed.)

Klopffer, Walter, i Birgit Grahl. Life Cycle Assessment (LCA): A Guide to Best Practice. Wiley-VCH Verlag GmbH & Co. KGaA, 2014.