↑ 1.01.11.21.3 Ancestry.com. U.S. Naturalization Record Indexes, 1791-1992 (Indexed in World Archives Project) [database on-line].
↑ Ancestry.com. 1910 U.S. Federal Census [database on-line].
↑ Gravestone, Mount Morris Cemetery, Maspeth, Queens.
English inscription: Beloved husband and father Morris J. Zimmerman, Died March 31, 1933 in his fifty-eighth year. Hebrew inscription: Mordchai Yosef son of Israel Dovid (translation courtesy Jeff M.)