BibTeX:
@incollection{BahChronicleseditors,
  author = {Bahá'í Chronicles editors},
  title = {The Martyrdom in Ashkhabad},
  booktitle = {Bahá'í Chronicles},
  url = {https://bahaichronicles.org/haji-muhammad-rida-isfahani/},
}

APA:
Bahá'í Chronicles editors. The Martyrdom in Ashkhabad. In *Bahá'í Chronicles*.

MLA:
Bahá'í Chronicles editors. "The Martyrdom in Ashkhabad." *Bahá'í Chronicles*, n.d..

Chicago:
Bahá'í Chronicles editors. "The Martyrdom in Ashkhabad." In *Bahá'í Chronicles*, n.d..