BibTeX:
@incollection{Various,
  author = {Various},
  title = {An example of ‘Abdu’l-Baha drawing from “the power of Baha’u’llah”},
  booktitle = {Baha'i Stories Blog},
  url = {https://bahaistories.blogspot.com/2018/05/an-example-of-abdul-baha-drawing-from.html},
}

APA:
Various. An example of ‘Abdu’l-Baha drawing from “the power of Baha’u’llah”. In *Baha'i Stories Blog*.

MLA:
Various. "An example of ‘Abdu’l-Baha drawing from “the power of Baha’u’llah”." *Baha'i Stories Blog*, n.d..

Chicago:
Various. "An example of ‘Abdu’l-Baha drawing from “the power of Baha’u’llah”." In *Baha'i Stories Blog*, n.d..