BibTeX:
@incollection{OnbehalfofShoghiEffendi1982,
  author = {On behalf of Shoghi Effendi},
  title = {So Calm, So Serene},
  booktitle = {Bahíyyih Khánum},
  year = {1982},
  pages = {Part IV, no. 4},
  url = {https://www.gutenberg.org/cache/epub/19242/pg19242-images.html},
}

APA:
On behalf of Shoghi Effendi. (1982). So Calm, So Serene. In *Bahíyyih Khánum* (p. Part IV, no. 4).

MLA:
On behalf of Shoghi Effendi. "So Calm, So Serene." *Bahíyyih Khánum*, 1982, p. Part IV, no. 4.

Chicago:
On behalf of Shoghi Effendi. "So Calm, So Serene." In *Bahíyyih Khánum*, Part IV, no. 4. 1982.