BibTeX:
@incollection{Various,
  author = {Various},
  title = {Opposition to 'Abdu'l-Baha's proposed marriage},
  booktitle = {Baha'i Stories Blog},
  url = {https://bahaistories.blogspot.com/2014/11/opposition-to-abdul-bahas-proposed.html},
}

APA:
Various. Opposition to 'Abdu'l-Baha's proposed marriage. In *Baha'i Stories Blog*.

MLA:
Various. "Opposition to 'Abdu'l-Baha's proposed marriage." *Baha'i Stories Blog*, n.d..

Chicago:
Various. "Opposition to 'Abdu'l-Baha's proposed marriage." In *Baha'i Stories Blog*, n.d..