APA (7th ed.) Citation

Kirchherr, J., Reike, D., & Hekkert, M. (2017). Conceptualizing the circular economy: An analysis of 114 definitions. Resources, conservation and recycling, 127, 221-232. https://doi.org/10.1016/j.resconrec.2017.09.005

Chicago Style (17th ed.) Citation

Kirchherr, Julian, Denise Reike, and Marko Hekkert. "Conceptualizing the Circular Economy: An Analysis of 114 Definitions." Resources, Conservation and Recycling 127 (2017): 221-232. https://doi.org/10.1016/j.resconrec.2017.09.005.

MLA (9th ed.) Citation

Kirchherr, Julian, et al. "Conceptualizing the Circular Economy: An Analysis of 114 Definitions." Resources, Conservation and Recycling, vol. 127, 2017, pp. 221-232, https://doi.org/10.1016/j.resconrec.2017.09.005.