BibTeX:
@incollection{LadyBlomfield1940,
  author = {Lady Blomfield},
  title = {The Most Great Branch, Eighteen Years Old},
  booktitle = {The Chosen Highway},
  year = {1940},
  publisher = {Bahá'í Publishing Trust},
}

APA:
Lady Blomfield. (1940). The Most Great Branch, Eighteen Years Old. In *The Chosen Highway*. Bahá'í Publishing Trust.

MLA:
Lady Blomfield. "The Most Great Branch, Eighteen Years Old." *The Chosen Highway*, Bahá'í Publishing Trust, 1940.

Chicago:
Lady Blomfield. "The Most Great Branch, Eighteen Years Old." In *The Chosen Highway*, Bahá'í Publishing Trust, 1940.