BibTeX:
@incollection{Various,
  author = {Various},
  title = {A Choice of Martyrdom},
  booktitle = {Baha'i Stories Blog},
  url = {https://bahaistories.blogspot.com/2020/05/abdul-bahas-surprising-response-to-two.html},
}

APA:
Various. A Choice of Martyrdom. In *Baha'i Stories Blog*.

MLA:
Various. "A Choice of Martyrdom." *Baha'i Stories Blog*, n.d..

Chicago:
Various. "A Choice of Martyrdom." In *Baha'i Stories Blog*, n.d..