BibTeX:
@incollection{BahChronicleseditors,
  author = {Bahá'í Chronicles editors},
  title = {A Gift for the Shrine of the Báb},
  booktitle = {Bahá'í Chronicles},
  url = {https://bahaichronicles.org/haji-mahmud-qassabchi/},
}

APA:
Bahá'í Chronicles editors. A Gift for the Shrine of the Báb. In *Bahá'í Chronicles*.

MLA:
Bahá'í Chronicles editors. "A Gift for the Shrine of the Báb." *Bahá'í Chronicles*, n.d..

Chicago:
Bahá'í Chronicles editors. "A Gift for the Shrine of the Báb." In *Bahá'í Chronicles*, n.d..