BibTeX:
@incollection{Various,
  author = {Various},
  title = {Once when ‘Abdu’l-Bahá was asked, ‘What is a Bahá’í?’, He replied},
  booktitle = {bahaistories.com archive},
  url = {https://bahaistories.com/subject/love},
}

APA:
Various. Once when ‘Abdu’l-Bahá was asked, ‘What is a Bahá’í?’, He replied. In *bahaistories.com archive*.

MLA:
Various. "Once when ‘Abdu’l-Bahá was asked, ‘What is a Bahá’í?’, He replied." *bahaistories.com archive*, n.d..

Chicago:
Various. "Once when ‘Abdu’l-Bahá was asked, ‘What is a Bahá’í?’, He replied." In *bahaistories.com archive*, n.d..