APA   Click to copy
Roberts, S. G. B., Dunbar, R. I. M., Pollet, T. V., & Kuppens, T. (2009). Exploring variation in active network size: Constraints and ego characteristics. SOCIAL NETWORKS, 31, 138–146. https://doi.org/10.1016/j.socnet.2008.12.002

Chicago/Turabian   Click to copy
Roberts, SGB, RIM Dunbar, TV Pollet, and T Kuppens. “Exploring Variation in Active Network Size: Constraints and Ego Characteristics.” SOCIAL NETWORKS 31 (May 1, 2009): 138–146.

MLA   Click to copy
Roberts, S. GB, et al. “Exploring Variation in Active Network Size: Constraints and Ego Characteristics.” SOCIAL NETWORKS, vol. 31, ELSEVIER SCIENCE BV, May 2009, pp. 138–46, doi:10.1016/j.socnet.2008.12.002.

@article{roberts2009a,
  title = {Exploring variation in active network size: Constraints and ego characteristics},
  year = {2009},
  month = may,
  day = {1},
  journal = {SOCIAL NETWORKS},
  pages = {138--146},
  publisher = {ELSEVIER SCIENCE BV},
  volume = {31},
  doi = {10.1016/j.socnet.2008.12.002},
  author = {Roberts, SGB and Dunbar, RIM and Pollet, TV and Kuppens, T},
  month_numeric = {5}
}