BibTeX:
@incollection{LadyBlomfield1940,
  author = {Lady Blomfield},
  title = {Let My Life Be a Ransom: The Purest Branch},
  booktitle = {The Chosen Highway},
  year = {1940},
  publisher = {Bahá'í Publishing Trust},
}

APA:
Lady Blomfield. (1940). Let My Life Be a Ransom: The Purest Branch. In *The Chosen Highway*. Bahá'í Publishing Trust.

MLA:
Lady Blomfield. "Let My Life Be a Ransom: The Purest Branch." *The Chosen Highway*, Bahá'í Publishing Trust, 1940.

Chicago:
Lady Blomfield. "Let My Life Be a Ransom: The Purest Branch." In *The Chosen Highway*, Bahá'í Publishing Trust, 1940.