BibTeX:
@incollection{AdibTaherzadeh1983,
  author = {Adib Taherzadeh},
  title = {A Letter to the Czar: Bahá'u'lláh's Tablet to Alexander II},
  booktitle = {The Revelation of Bahá'u'lláh (Vol. 3 — 'Akká, the Early Years)},
  year = {1983},
  publisher = {George Ronald},
}

APA:
Adib Taherzadeh. (1983). A Letter to the Czar: Bahá'u'lláh's Tablet to Alexander II. In *The Revelation of Bahá'u'lláh (Vol. 3 — 'Akká, the Early Years)*. George Ronald.

MLA:
Adib Taherzadeh. "A Letter to the Czar: Bahá'u'lláh's Tablet to Alexander II." *The Revelation of Bahá'u'lláh (Vol. 3 — 'Akká, the Early Years)*, George Ronald, 1983.

Chicago:
Adib Taherzadeh. "A Letter to the Czar: Bahá'u'lláh's Tablet to Alexander II." In *The Revelation of Bahá'u'lláh (Vol. 3 — 'Akká, the Early Years)*, George Ronald, 1983.