BibTeX:
@incollection{Various,
  author = {Various},
  title = {Bahá’u’lláh could trust ‘Abdu’l-Bahá with the most difficult of tasks},
  booktitle = {bahaistories.com archive},
  url = {https://bahaistories.com/subject/anxiety},
}

APA:
Various. Bahá’u’lláh could trust ‘Abdu’l-Bahá with the most difficult of tasks. In *bahaistories.com archive*.

MLA:
Various. "Bahá’u’lláh could trust ‘Abdu’l-Bahá with the most difficult of tasks." *bahaistories.com archive*, n.d..

Chicago:
Various. "Bahá’u’lláh could trust ‘Abdu’l-Bahá with the most difficult of tasks." In *bahaistories.com archive*, n.d..