BibTeX:
@incollection{AdibTaherzadeh1974,
  author = {Adib Taherzadeh},
  title = {The Ornament of the Near Ones: Zaynu'l-Muqarrabín},
  booktitle = {The Revelation of Bahá'u'lláh},
  year = {1974},
  publisher = {George Ronald},
}

APA:
Adib Taherzadeh. (1974). The Ornament of the Near Ones: Zaynu'l-Muqarrabín. In *The Revelation of Bahá'u'lláh*. George Ronald.

MLA:
Adib Taherzadeh. "The Ornament of the Near Ones: Zaynu'l-Muqarrabín." *The Revelation of Bahá'u'lláh*, George Ronald, 1974.

Chicago:
Adib Taherzadeh. "The Ornament of the Near Ones: Zaynu'l-Muqarrabín." In *The Revelation of Bahá'u'lláh*, George Ronald, 1974.