BibTeX:
@incollection{StaroftheWestEditors1916,
  author = {Star of the West Editors},
  title = {Agnes Alexander's Letter from Tokyo},
  booktitle = {Star of the West},
  year = {1916},
  publisher = {Bahai News Service},
  url = {https://bahai-library.com/star_of_the_west_volume_1},
}

APA:
Star of the West Editors. (1916). Agnes Alexander's Letter from Tokyo. In *Star of the West*. Bahai News Service.

MLA:
Star of the West Editors. "Agnes Alexander's Letter from Tokyo." *Star of the West*, Bahai News Service, 1916.

Chicago:
Star of the West Editors. "Agnes Alexander's Letter from Tokyo." In *Star of the West*, Bahai News Service, 1916.