BibTeX:
@incollection{Various,
  author = {Various},
  title = {Joseph Hannen records: “On Tuesday, April 23rd, at noon, ‘Abdu’l-Bahá addressed},
  booktitle = {bahaistories.com archive},
  url = {https://bahaistories.com/subject/race-unity},
}

APA:
Various. Joseph Hannen records: “On Tuesday, April 23rd, at noon, ‘Abdu’l-Bahá addressed. In *bahaistories.com archive*.

MLA:
Various. "Joseph Hannen records: “On Tuesday, April 23rd, at noon, ‘Abdu’l-Bahá addressed." *bahaistories.com archive*, n.d..

Chicago:
Various. "Joseph Hannen records: “On Tuesday, April 23rd, at noon, ‘Abdu’l-Bahá addressed." In *bahaistories.com archive*, n.d..