BibTeX:
@incollection{Various,
  author = {Various},
  title = {Once ‘Abdu’l-Bahá asked His Father, Bahá’u’lláh why it was He had never clearly},
  booktitle = {bahaistories.com archive},
  url = {https://bahaistories.com/subject/universal-language},
}

APA:
Various. Once ‘Abdu’l-Bahá asked His Father, Bahá’u’lláh why it was He had never clearly. In *bahaistories.com archive*.

MLA:
Various. "Once ‘Abdu’l-Bahá asked His Father, Bahá’u’lláh why it was He had never clearly." *bahaistories.com archive*, n.d..

Chicago:
Various. "Once ‘Abdu’l-Bahá asked His Father, Bahá’u’lláh why it was He had never clearly." In *bahaistories.com archive*, n.d..