BibTeX:
@incollection{Various,
  author = {Various},
  title = {Visiting the Library of Congress in Washington, D.C. – an example of ‘Abdu’l-Baha’s…},
  booktitle = {Baha'i Stories Blog},
  url = {https://bahaistories.blogspot.com/2013/11/visiting-library-of-congress-in.html},
}

APA:
Various. Visiting the Library of Congress in Washington, D.C. – an example of ‘Abdu’l-Baha’s…. In *Baha'i Stories Blog*.

MLA:
Various. "Visiting the Library of Congress in Washington, D.C. – an example of ‘Abdu’l-Baha’s…." *Baha'i Stories Blog*, n.d..

Chicago:
Various. "Visiting the Library of Congress in Washington, D.C. – an example of ‘Abdu’l-Baha’s…." In *Baha'i Stories Blog*, n.d..