BibTeX:
@incollection{Various,
  author = {Various},
  title = {My Invitation to America},
  booktitle = {bahaistories.com archive},
  url = {https://bahaistories.com/subject/abdul-bahas-travels},
}

APA:
Various. My Invitation to America. In *bahaistories.com archive*.

MLA:
Various. "My Invitation to America." *bahaistories.com archive*, n.d..

Chicago:
Various. "My Invitation to America." In *bahaistories.com archive*, n.d..