Source Information
Ancestry.com. Mr. Kingsford and Sir H. Langevin C.B.: the case considered with the official correspondence, a memoir for the historian of the future [database on-line]. Provo, UT, USA: Ancestry.com Operations Inc, 2008.Original data: William Kingsford. Mr. Kingsford and Sir H. Langevin C.B.: the case considered with the official correspondence, a memoir for the historian of the future. [Toronto?]: [s.n.], 1882.
