BibTeX:
@incollection{Various,
  author = {Various},
  title = {When ‘Abdu’l-Bahá was in Stuttgart, Germany, in 1913, He related an},
  booktitle = {bahaistories.com archive},
  url = {https://bahaistories.com/subject/teaching},
}

APA:
Various. When ‘Abdu’l-Bahá was in Stuttgart, Germany, in 1913, He related an. In *bahaistories.com archive*.

MLA:
Various. "When ‘Abdu’l-Bahá was in Stuttgart, Germany, in 1913, He related an." *bahaistories.com archive*, n.d..

Chicago:
Various. "When ‘Abdu’l-Bahá was in Stuttgart, Germany, in 1913, He related an." In *bahaistories.com archive*, n.d..