References for Johan Adolph! Henrik Larsen Graf v.Ahlefeld-Laurvig
Genealogisches Handbuch des Adels - Gräfliche Häuser, Vol.A6.
Limburg/Lahn, 1970
M.A.H., Marquis de Ruvigny:
The Titled Nobility of Europe.
Harrison & Sons, Landon, 1914