BibTeX:
@incollection{Various,
  author = {Various},
  title = {On a certain occasion in America ‘Abdu’l-Bahá ‘announced that He wished to give},
  booktitle = {bahaistories.com archive},
  url = {https://bahaistories.com/subject/race-unity},
}

APA:
Various. On a certain occasion in America ‘Abdu’l-Bahá ‘announced that He wished to give. In *bahaistories.com archive*.

MLA:
Various. "On a certain occasion in America ‘Abdu’l-Bahá ‘announced that He wished to give." *bahaistories.com archive*, n.d..

Chicago:
Various. "On a certain occasion in America ‘Abdu’l-Bahá ‘announced that He wished to give." In *bahaistories.com archive*, n.d..