APA   Click to copy
Crutzen, N., & Marolla, C. (2017). The Epoch of Smart Cities and Innovation.

Chicago/Turabian   Click to copy
Crutzen, Nathalie, and Cesar Marolla. “The Epoch of Smart Cities and Innovation.” (2017).

MLA   Click to copy
Crutzen, Nathalie, and Cesar Marolla. The Epoch of Smart Cities and Innovation. 2017.

@article{nathalie2017a,
  title = {The Epoch of Smart Cities and Innovation.},
  year = {2017},
  author = {Crutzen, Nathalie and Marolla, Cesar}
}