BibTeX:
@incollection{BahyyihKhnum1982,
  author = {Bahíyyih Khánum},
  title = {On Steadfastness},
  booktitle = {Bahíyyih Khánum},
  year = {1982},
  pages = {Part V, no. 40},
  url = {https://www.gutenberg.org/cache/epub/19242/pg19242-images.html},
}

APA:
Bahíyyih Khánum. (1982). On Steadfastness. In *Bahíyyih Khánum* (p. Part V, no. 40).

MLA:
Bahíyyih Khánum. "On Steadfastness." *Bahíyyih Khánum*, 1982, p. Part V, no. 40.

Chicago:
Bahíyyih Khánum. "On Steadfastness." In *Bahíyyih Khánum*, Part V, no. 40. 1982.