BibTeX:
@incollection{RhyyihRabbn1969,
  author = {Rúhíyyih Rabbání},
  title = {The Gardens No One Believed In},
  booktitle = {The Priceless Pearl},
  year = {1969},
  publisher = {Bahá'í Publishing Trust},
  url = {https://bahai-library.com/khanum_priceless_pearl},
}

APA:
Rúhíyyih Rabbání. (1969). The Gardens No One Believed In. In *The Priceless Pearl*. Bahá'í Publishing Trust.

MLA:
Rúhíyyih Rabbání. "The Gardens No One Believed In." *The Priceless Pearl*, Bahá'í Publishing Trust, 1969.

Chicago:
Rúhíyyih Rabbání. "The Gardens No One Believed In." In *The Priceless Pearl*, Bahá'í Publishing Trust, 1969.