BibTeX:
@incollection{AdibTaherzadeh1987,
  author = {Adib Taherzadeh},
  title = {The Ascension of Bahá'u'lláh at Bahjí},
  booktitle = {The Revelation of Bahá'u'lláh (Vol. 4 — Mazra'ih and Bahjí 1877-92)},
  year = {1987},
  publisher = {George Ronald},
}

APA:
Adib Taherzadeh. (1987). The Ascension of Bahá'u'lláh at Bahjí. In *The Revelation of Bahá'u'lláh (Vol. 4 — Mazra'ih and Bahjí 1877-92)*. George Ronald.

MLA:
Adib Taherzadeh. "The Ascension of Bahá'u'lláh at Bahjí." *The Revelation of Bahá'u'lláh (Vol. 4 — Mazra'ih and Bahjí 1877-92)*, George Ronald, 1987.

Chicago:
Adib Taherzadeh. "The Ascension of Bahá'u'lláh at Bahjí." In *The Revelation of Bahá'u'lláh (Vol. 4 — Mazra'ih and Bahjí 1877-92)*, George Ronald, 1987.