BibTeX:
@incollection{Various,
  author = {Various},
  title = {The story of ‘Abdu’l-Baha – Part 1: 1844-1908},
  booktitle = {Baha'i Stories Blog},
  url = {https://bahaistories.blogspot.com/2020/07/the-story-of-abdul-baha-part-1-1844-1908.html},
}

APA:
Various. The story of ‘Abdu’l-Baha – Part 1: 1844-1908. In *Baha'i Stories Blog*.

MLA:
Various. "The story of ‘Abdu’l-Baha – Part 1: 1844-1908." *Baha'i Stories Blog*, n.d..

Chicago:
Various. "The story of ‘Abdu’l-Baha – Part 1: 1844-1908." In *Baha'i Stories Blog*, n.d..