BibTeX:
@incollection{Various,
  author = {Various},
  title = {Mulla Husayn’s first assignment},
  booktitle = {Baha'i Stories Blog},
  url = {https://bahaistories.blogspot.com/2015/11/mulla-husayns-first-assignment.html},
}

APA:
Various. Mulla Husayn’s first assignment. In *Baha'i Stories Blog*.

MLA:
Various. "Mulla Husayn’s first assignment." *Baha'i Stories Blog*, n.d..

Chicago:
Various. "Mulla Husayn’s first assignment." In *Baha'i Stories Blog*, n.d..