BibTeX:
@incollection{Various,
  author = {Various},
  title = {circa 1850: Nabil, the author of Dawn-Breakers, took ‘Abdu’l-Baha to school one day},
  booktitle = {Baha'i Stories Blog},
  url = {https://bahaistories.blogspot.com/2018/01/circa-1850-nabil-author-of-dawn.html},
}

APA:
Various. circa 1850: Nabil, the author of Dawn-Breakers, took ‘Abdu’l-Baha to school one day. In *Baha'i Stories Blog*.

MLA:
Various. "circa 1850: Nabil, the author of Dawn-Breakers, took ‘Abdu’l-Baha to school one day." *Baha'i Stories Blog*, n.d..

Chicago:
Various. "circa 1850: Nabil, the author of Dawn-Breakers, took ‘Abdu’l-Baha to school one day." In *Baha'i Stories Blog*, n.d..