BibTeX:
@incollection{Various,
  author = {Various},
  title = {‘Abdu’l-Bahá said, “You are very welcome and it makes me happy to see you here in London},
  booktitle = {bahaistories.com archive},
  url = {https://bahaistories.com/subject/marriage},
}

APA:
Various. ‘Abdu’l-Bahá said, “You are very welcome and it makes me happy to see you here in London. In *bahaistories.com archive*.

MLA:
Various. "‘Abdu’l-Bahá said, “You are very welcome and it makes me happy to see you here in London." *bahaistories.com archive*, n.d..

Chicago:
Various. "‘Abdu’l-Bahá said, “You are very welcome and it makes me happy to see you here in London." In *bahaistories.com archive*, n.d..