BibTeX:
@incollection{AbdulBah1912,
  author = {'Abdu'l-Bahá},
  title = {A Garden of Many Flowers: 'Abdu'l-Bahá in Paris},
  booktitle = {Paris Talks},
  year = {1912},
  publisher = {Bahá'í Publishing Trust},
  url = {https://www.bahai.org/library/authoritative-texts/abdul-baha/paris-talks/},
}

APA:
'Abdu'l-Bahá. (1912). A Garden of Many Flowers: 'Abdu'l-Bahá in Paris. In *Paris Talks*. Bahá'í Publishing Trust.

MLA:
'Abdu'l-Bahá. "A Garden of Many Flowers: 'Abdu'l-Bahá in Paris." *Paris Talks*, Bahá'í Publishing Trust, 1912.

Chicago:
'Abdu'l-Bahá. "A Garden of Many Flowers: 'Abdu'l-Bahá in Paris." In *Paris Talks*, Bahá'í Publishing Trust, 1912.