BibTeX:
@incollection{AbdulBah1908,
  author = {'Abdu'l-Bahá},
  title = {Some Answered Questions: The Immortality of the Soul},
  booktitle = {Some Answered Questions},
  year = {1908},
  publisher = {Bahá'í Publishing Trust},
  url = {https://www.bahai.org/library/authoritative-texts/abdul-baha/some-answered-questions/},
}

APA:
'Abdu'l-Bahá. (1908). Some Answered Questions: The Immortality of the Soul. In *Some Answered Questions*. Bahá'í Publishing Trust.

MLA:
'Abdu'l-Bahá. "Some Answered Questions: The Immortality of the Soul." *Some Answered Questions*, Bahá'í Publishing Trust, 1908.

Chicago:
'Abdu'l-Bahá. "Some Answered Questions: The Immortality of the Soul." In *Some Answered Questions*, Bahá'í Publishing Trust, 1908.