BibTeX:
@incollection{BahyyihKhnumandothers1982,
  author = {Bahíyyih Khánum and others},
  title = {54: The letter that you wrote in your burning},
  booktitle = {Bahíyyih Khánum},
  year = {1982},
  url = {https://www.gutenberg.org/cache/epub/19242/pg19242-images.html},
}

APA:
Bahíyyih Khánum and others. (1982). 54: The letter that you wrote in your burning. In *Bahíyyih Khánum*.

MLA:
Bahíyyih Khánum and others. "54: The letter that you wrote in your burning." *Bahíyyih Khánum*, 1982.

Chicago:
Bahíyyih Khánum and others. "54: The letter that you wrote in your burning." In *Bahíyyih Khánum*, 1982.