BibTeX:
@incollection{ShoghiEffendi1982,
  author = {Shoghi Effendi},
  title = {A Far-Flung Arc},
  booktitle = {Bahíyyih Khánum},
  year = {1982},
  pages = {Part III, no. 33},
  url = {https://www.gutenberg.org/cache/epub/19242/pg19242-images.html},
}

APA:
Shoghi Effendi. (1982). A Far-Flung Arc. In *Bahíyyih Khánum* (p. Part III, no. 33).

MLA:
Shoghi Effendi. "A Far-Flung Arc." *Bahíyyih Khánum*, 1982, p. Part III, no. 33.

Chicago:
Shoghi Effendi. "A Far-Flung Arc." In *Bahíyyih Khánum*, Part III, no. 33. 1982.