BibTeX:
@incollection{Various,
  author = {Various},
  title = {Are You Happy? Be Happy!},
  booktitle = {bahaistories.com archive},
  url = {https://bahaistories.com/subject/happiness},
}

APA:
Various. Are You Happy? Be Happy!. In *bahaistories.com archive*.

MLA:
Various. "Are You Happy? Be Happy!." *bahaistories.com archive*, n.d..

Chicago:
Various. "Are You Happy? Be Happy!." In *bahaistories.com archive*, n.d..