APA (7th ed.) Citation

Dunbar, R., Arnaboldi, V., Conti, M., & Passarella, A. (2015). The structure of online social networks mirrors those in the offline world. Elsevier.

Chicago Style (17th ed.) Citation

Dunbar, R., V. Arnaboldi, M. Conti, and A. Passarella. The Structure of Online Social Networks Mirrors Those in the Offline World. Elsevier, 2015.

MLA (9th ed.) Citation

Dunbar, R., et al. The Structure of Online Social Networks Mirrors Those in the Offline World. Elsevier, 2015.