BibTeX:
@incollection{HowardColbyIves1937,
  author = {Howard Colby Ives},
  title = {The Greatest Sovereign Is Love},
  booktitle = {Portals to Freedom},
  year = {1937},
  publisher = {George Ronald},
  url = {https://bahai-library.com/ives_portals_freedom},
}

APA:
Howard Colby Ives. (1937). The Greatest Sovereign Is Love. In *Portals to Freedom*. George Ronald.

MLA:
Howard Colby Ives. "The Greatest Sovereign Is Love." *Portals to Freedom*, George Ronald, 1937.

Chicago:
Howard Colby Ives. "The Greatest Sovereign Is Love." In *Portals to Freedom*, George Ronald, 1937.