BibTeX:
@incollection{ShoghiEffendi1982,
  author = {Shoghi Effendi},
  title = {Entreat Sorrow Stricken American Believers},
  booktitle = {Bahíyyih Khánum},
  year = {1982},
  url = {https://www.gutenberg.org/cache/epub/19242/pg19242-images.html},
}

APA:
Shoghi Effendi. (1982). Entreat Sorrow Stricken American Believers. In *Bahíyyih Khánum*.

MLA:
Shoghi Effendi. "Entreat Sorrow Stricken American Believers." *Bahíyyih Khánum*, 1982.

Chicago:
Shoghi Effendi. "Entreat Sorrow Stricken American Believers." In *Bahíyyih Khánum*, 1982.