BibTeX:
@incollection{AdibTaherzadeh1974,
  author = {Adib Taherzadeh},
  title = {Zaynu'l-Muqarrabín, Scribe of the Tablets},
  booktitle = {The Revelation of Bahá'u'lláh (Vol. 1)},
  year = {1974},
  publisher = {George Ronald},
}

APA:
Adib Taherzadeh. (1974). Zaynu'l-Muqarrabín, Scribe of the Tablets. In *The Revelation of Bahá'u'lláh (Vol. 1)*. George Ronald.

MLA:
Adib Taherzadeh. "Zaynu'l-Muqarrabín, Scribe of the Tablets." *The Revelation of Bahá'u'lláh (Vol. 1)*, George Ronald, 1974.

Chicago:
Adib Taherzadeh. "Zaynu'l-Muqarrabín, Scribe of the Tablets." In *The Revelation of Bahá'u'lláh (Vol. 1)*, George Ronald, 1974.