BibTeX:
@incollection{Various,
  author = {Various},
  title = {June-July 1849: The Báb’s immeasurable sorrow when the news of the martyrdom of Mulla Husayn, the heroes of Tabarsí, and Quddus reached Him},
  booktitle = {Baha'i Stories Blog},
  url = {https://bahaistories.blogspot.com/2018/04/june-july-1849-babs-immeasurable-sorrow.html},
}

APA:
Various. June-July 1849: The Báb’s immeasurable sorrow when the news of the martyrdom of Mulla Husayn, the heroes of Tabarsí, and Quddus reached Him. In *Baha'i Stories Blog*.

MLA:
Various. "June-July 1849: The Báb’s immeasurable sorrow when the news of the martyrdom of Mulla Husayn, the heroes of Tabarsí, and Quddus reached Him." *Baha'i Stories Blog*, n.d..

Chicago:
Various. "June-July 1849: The Báb’s immeasurable sorrow when the news of the martyrdom of Mulla Husayn, the heroes of Tabarsí, and Quddus reached Him." In *Baha'i Stories Blog*, n.d..