BibTeX:
@incollection{NabliAam1932,
  author = {Nabíl-i-Aʻẓam},
  title = {I Am the Promised One},
  booktitle = {The Dawn-Breakers (Nabíl's Narrative)},
  year = {1932},
  publisher = {Bahá'í Publishing Trust},
  url = {https://reference.bahai.org/en/t/nz/DB/},
}

APA:
Nabíl-i-Aʻẓam. (1932). I Am the Promised One. In *The Dawn-Breakers (Nabíl's Narrative)*. Bahá'í Publishing Trust.

MLA:
Nabíl-i-Aʻẓam. "I Am the Promised One." *The Dawn-Breakers (Nabíl's Narrative)*, Bahá'í Publishing Trust, 1932.

Chicago:
Nabíl-i-Aʻẓam. "I Am the Promised One." In *The Dawn-Breakers (Nabíl's Narrative)*, Bahá'í Publishing Trust, 1932.