BibTeX:
@incollection{BahChronicleseditors,
  author = {Bahá'í Chronicles editors},
  title = {The Báb – Herald of the Bahá’í Faith},
  booktitle = {Bahá'í Chronicles},
  url = {https://bahaichronicles.org/the-bab-herald-of-the-bahai-faith/},
}

APA:
Bahá'í Chronicles editors. The Báb – Herald of the Bahá’í Faith. In *Bahá'í Chronicles*.

MLA:
Bahá'í Chronicles editors. "The Báb – Herald of the Bahá’í Faith." *Bahá'í Chronicles*, n.d..

Chicago:
Bahá'í Chronicles editors. "The Báb – Herald of the Bahá’í Faith." In *Bahá'í Chronicles*, n.d..