APA   Click to copy
Fritz, J., & Young, J. K. (2020). Transnational volunteers: American foreign fighters combating the Islamic State. Terrorism and Political Violence, 32, 449–468.

Chicago/Turabian   Click to copy
Fritz, Jason, and Joseph K Young. “Transnational Volunteers: American Foreign Fighters Combating the Islamic State.” Terrorism and Political Violence 32 (2020): 449–468.

MLA   Click to copy
Fritz, Jason, and Joseph K. Young. “Transnational Volunteers: American Foreign Fighters Combating the Islamic State.” Terrorism and Political Violence, vol. 32, Routledge, 2020, pp. 449–68.

@article{fritz2020a,
  title = {Transnational volunteers: American foreign fighters combating the Islamic State},
  year = {2020},
  journal = {Terrorism and Political Violence},
  pages = {449-468},
  publisher = {Routledge},
  volume = {32},
  author = {Fritz, Jason and Young, Joseph K}
}