BibTeX:
@incollection{Various,
  author = {Various},
  title = {Túbá Khánum Remembers Her Grandfather},
  booktitle = {Baha'i Stories for Children},
  url = {https://bahaistoriesforchildren.blogspot.com/2020/02/one-of-bahaullahs-granddaughters.html},
}

APA:
Various. Túbá Khánum Remembers Her Grandfather. In *Baha'i Stories for Children*.

MLA:
Various. "Túbá Khánum Remembers Her Grandfather." *Baha'i Stories for Children*, n.d..

Chicago:
Various. "Túbá Khánum Remembers Her Grandfather." In *Baha'i Stories for Children*, n.d..