BibTeX:
@incollection{MrzMamdiZarqn1998,
  author = {Mírzá Maḥmúd-i-Zarqání},
  title = {Islam From a Brooklyn Pulpit},
  booktitle = {Mahmúd's Diary: The Diary of Mírzá Maḥmúd-i-Zarqání},
  year = {1998},
}

APA:
Mírzá Maḥmúd-i-Zarqání. (1998). Islam From a Brooklyn Pulpit. In *Mahmúd's Diary: The Diary of Mírzá Maḥmúd-i-Zarqání*.

MLA:
Mírzá Maḥmúd-i-Zarqání. "Islam From a Brooklyn Pulpit." *Mahmúd's Diary: The Diary of Mírzá Maḥmúd-i-Zarqání*, 1998.

Chicago:
Mírzá Maḥmúd-i-Zarqání. "Islam From a Brooklyn Pulpit." In *Mahmúd's Diary: The Diary of Mírzá Maḥmúd-i-Zarqání*, 1998.