BibTeX:
@incollection{Various,
  author = {Various},
  title = {‘Abdu’l-Bahá Tells of His Imprisonment},
  booktitle = {Baha'i Stories Blog},
  url = {https://bahaistories.blogspot.com/2013/09/abdul-bha-tells-story-of-his-prison.html},
}

APA:
Various. ‘Abdu’l-Bahá Tells of His Imprisonment. In *Baha'i Stories Blog*.

MLA:
Various. "‘Abdu’l-Bahá Tells of His Imprisonment." *Baha'i Stories Blog*, n.d..

Chicago:
Various. "‘Abdu’l-Bahá Tells of His Imprisonment." In *Baha'i Stories Blog*, n.d..