BibTeX:
@incollection{Various,
  author = {Various},
  title = {A pilgrim reports in 1920 how busy ‘Abdu’l-Bahá was replying to numerous letters from…},
  booktitle = {Baha'i Stories Blog},
  url = {https://bahaistories.blogspot.com/2021/10/in-1920-pilgrim-becomes-aware-of-how.html},
}

APA:
Various. A pilgrim reports in 1920 how busy ‘Abdu’l-Bahá was replying to numerous letters from…. In *Baha'i Stories Blog*.

MLA:
Various. "A pilgrim reports in 1920 how busy ‘Abdu’l-Bahá was replying to numerous letters from…." *Baha'i Stories Blog*, n.d..

Chicago:
Various. "A pilgrim reports in 1920 how busy ‘Abdu’l-Bahá was replying to numerous letters from…." In *Baha'i Stories Blog*, n.d..