BibTeX:
@incollection{Various,
  author = {Various},
  title = {Major Wellesley Tudor-Pole wrote in his diary in 1918, at the time of his visit},
  booktitle = {bahaistories.com archive},
  url = {https://bahaistories.com/subject/generosity},
}

APA:
Various. Major Wellesley Tudor-Pole wrote in his diary in 1918, at the time of his visit. In *bahaistories.com archive*.

MLA:
Various. "Major Wellesley Tudor-Pole wrote in his diary in 1918, at the time of his visit." *bahaistories.com archive*, n.d..

Chicago:
Various. "Major Wellesley Tudor-Pole wrote in his diary in 1918, at the time of his visit." In *bahaistories.com archive*, n.d..