BibTeX:
@incollection{AdibTaherzadeh1974,
  author = {Adib Taherzadeh},
  title = {The Family Reunited in the Garden: Ninth Day of Riḍván},
  booktitle = {The Revelation of Bahá'u'lláh (volume 1)},
  year = {1974},
  publisher = {George Ronald},
}

APA:
Adib Taherzadeh. (1974). The Family Reunited in the Garden: Ninth Day of Riḍván. In *The Revelation of Bahá'u'lláh (volume 1)*. George Ronald.

MLA:
Adib Taherzadeh. "The Family Reunited in the Garden: Ninth Day of Riḍván." *The Revelation of Bahá'u'lláh (volume 1)*, George Ronald, 1974.

Chicago:
Adib Taherzadeh. "The Family Reunited in the Garden: Ninth Day of Riḍván." In *The Revelation of Bahá'u'lláh (volume 1)*, George Ronald, 1974.