BibTeX:
@incollection{ShoghiEffendi1944,
  author = {Shoghi Effendi},
  title = {The Last Days of 'Abdu'l-Bahá},
  booktitle = {God Passes By},
  year = {1944},
  publisher = {Baha'i Publishing Trust},
}

APA:
Shoghi Effendi. (1944). The Last Days of 'Abdu'l-Bahá. In *God Passes By*. Baha'i Publishing Trust.

MLA:
Shoghi Effendi. "The Last Days of 'Abdu'l-Bahá." *God Passes By*, Baha'i Publishing Trust, 1944.

Chicago:
Shoghi Effendi. "The Last Days of 'Abdu'l-Bahá." In *God Passes By*, Baha'i Publishing Trust, 1944.