BibTeX:
@incollection{ShoghiEffendi1982,
  author = {Shoghi Effendi},
  title = {Reunited on Mount Carmel},
  booktitle = {Bahíyyih Khánum},
  year = {1982},
  pages = {Part III, no. 29},
  url = {https://www.gutenberg.org/cache/epub/19242/pg19242-images.html},
}

APA:
Shoghi Effendi. (1982). Reunited on Mount Carmel. In *Bahíyyih Khánum* (p. Part III, no. 29).

MLA:
Shoghi Effendi. "Reunited on Mount Carmel." *Bahíyyih Khánum*, 1982, p. Part III, no. 29.

Chicago:
Shoghi Effendi. "Reunited on Mount Carmel." In *Bahíyyih Khánum*, Part III, no. 29. 1982.