BibTeX:
@incollection{Various,
  author = {Various},
  title = {Baha’u’llah during His youthful prime – told by ‘Abdu’l-Baha},
  booktitle = {Baha'i Stories Blog},
  url = {https://bahaistories.blogspot.com/2014/09/bahaullah-during-his-youthful-prime.html},
}

APA:
Various. Baha’u’llah during His youthful prime – told by ‘Abdu’l-Baha. In *Baha'i Stories Blog*.

MLA:
Various. "Baha’u’llah during His youthful prime – told by ‘Abdu’l-Baha." *Baha'i Stories Blog*, n.d..

Chicago:
Various. "Baha’u’llah during His youthful prime – told by ‘Abdu’l-Baha." In *Baha'i Stories Blog*, n.d..