BibTeX:
@incollection{AdibTaherzadeh1987,
  author = {Adib Taherzadeh},
  title = {The Words Recited at His Threshold: The Tablet of Visitation},
  booktitle = {The Revelation of Bahá'u'lláh, Volume 4},
  year = {1987},
  publisher = {George Ronald},
}

APA:
Adib Taherzadeh. (1987). The Words Recited at His Threshold: The Tablet of Visitation. In *The Revelation of Bahá'u'lláh, Volume 4*. George Ronald.

MLA:
Adib Taherzadeh. "The Words Recited at His Threshold: The Tablet of Visitation." *The Revelation of Bahá'u'lláh, Volume 4*, George Ronald, 1987.

Chicago:
Adib Taherzadeh. "The Words Recited at His Threshold: The Tablet of Visitation." In *The Revelation of Bahá'u'lláh, Volume 4*, George Ronald, 1987.