BibTeX:
@incollection{BahChronicleseditors,
  author = {Bahá'í Chronicles editors},
  title = {Martha Root: The Leading Ambassadress of the Faith},
  booktitle = {Bahá'í Chronicles},
  url = {https://bahaichronicles.org/martha-root/},
}

APA:
Bahá'í Chronicles editors. Martha Root: The Leading Ambassadress of the Faith. In *Bahá'í Chronicles*.

MLA:
Bahá'í Chronicles editors. "Martha Root: The Leading Ambassadress of the Faith." *Bahá'í Chronicles*, n.d..

Chicago:
Bahá'í Chronicles editors. "Martha Root: The Leading Ambassadress of the Faith." In *Bahá'í Chronicles*, n.d..