BibTeX:
@incollection{RhyyihKhnum1969,
  author = {Rúhíyyih Khánum},
  title = {The Shepherd Who Grieved With the Flock: Shoghi Effendi's Compassion},
  booktitle = {The Priceless Pearl},
  year = {1969},
  publisher = {Bahá'í Publishing Trust},
}

APA:
Rúhíyyih Khánum. (1969). The Shepherd Who Grieved With the Flock: Shoghi Effendi's Compassion. In *The Priceless Pearl*. Bahá'í Publishing Trust.

MLA:
Rúhíyyih Khánum. "The Shepherd Who Grieved With the Flock: Shoghi Effendi's Compassion." *The Priceless Pearl*, Bahá'í Publishing Trust, 1969.

Chicago:
Rúhíyyih Khánum. "The Shepherd Who Grieved With the Flock: Shoghi Effendi's Compassion." In *The Priceless Pearl*, Bahá'í Publishing Trust, 1969.