BibTeX:
@incollection{ShoghiEffendi,
  author = {Shoghi Effendi},
  title = {Forty Years to the Last Step},
  booktitle = {God Passes By},
}

APA:
Shoghi Effendi. Forty Years to the Last Step. In *God Passes By*.

MLA:
Shoghi Effendi. "Forty Years to the Last Step." *God Passes By*, n.d..

Chicago:
Shoghi Effendi. "Forty Years to the Last Step." In *God Passes By*, n.d..