BibTeX:
@incollection{LouisGGregory1921,
  author = {Louis G. Gregory},
  title = {The First Convention for Amity Between the Races},
  booktitle = {Star of the West, vol. 12, no. 6 (June 24, 1921)},
  year = {1921},
  publisher = {Bahai News Service},
  url = {https://bahai.works/Star_of_the_West/Volume_12/Issue_6},
}

APA:
Louis G. Gregory. (1921). The First Convention for Amity Between the Races. In *Star of the West, vol. 12, no. 6 (June 24, 1921)*. Bahai News Service.

MLA:
Louis G. Gregory. "The First Convention for Amity Between the Races." *Star of the West, vol. 12, no. 6 (June 24, 1921)*, Bahai News Service, 1921.

Chicago:
Louis G. Gregory. "The First Convention for Amity Between the Races." In *Star of the West, vol. 12, no. 6 (June 24, 1921)*, Bahai News Service, 1921.