BibTeX:
@incollection{Various,
  author = {Various},
  title = {One day in early May 1912, ‘Abdu’l-Bahá travelled by train from Pittsburgh,…},
  booktitle = {bahaistories.com archive},
  url = {https://bahaistories.com/subject/selfless},
}

APA:
Various. One day in early May 1912, ‘Abdu’l-Bahá travelled by train from Pittsburgh,…. In *bahaistories.com archive*.

MLA:
Various. "One day in early May 1912, ‘Abdu’l-Bahá travelled by train from Pittsburgh,…." *bahaistories.com archive*, n.d..

Chicago:
Various. "One day in early May 1912, ‘Abdu’l-Bahá travelled by train from Pittsburgh,…." In *bahaistories.com archive*, n.d..