"Herzogliche Orden", Staats- und Adreß-Handbuch des Herzogthums Nassau, 1866, p. 9
dis-danmark.dk
Bille-Hansen, A. C.; Holck, Harald, eds. (1923) [1st pub.:1801]. Statshaandbog for Kongeriget Danmark for Aaret 1923 [State Manual of the Kingdom of Denmark for the Year 1923] (PDF). Kongelig Dansk Hof- og Statskalender (in Danish). Copenhagen: J.H. Schultz A.-S. Universitetsbogtrykkeri. pp. 35–36. Retrieved 16 September 2019 – via da:DIS Danmark.
Dorotheum Auctions. (2015.May 7). "Ernst August, Crown Prince of Hannover, Duke of Cumberland (Lot No. 218)." Retrieved from: [1]. Notes: The rank of "generalmajor" translates to "major general" but was equal in rank to a brigadier in the British Army and brigadier general in the U.S. Army.
Bille-Hansen, A. C.; Holck, Harald, eds. (1923) [1st pub.:1801]. Statshaandbog for Kongeriget Danmark for Aaret 1923 [State Manual of the Kingdom of Denmark for the Year 1923] (PDF). Kongelig Dansk Hof- og Statskalender (in Danish). Copenhagen: J.H. Schultz A.-S. Universitetsbogtrykkeri. pp. 35–36. Retrieved 16 September 2019 – via da:DIS Danmark.