1. G. Schon. "Weltmunzkatalog 20. Jahrhundert".

2. G. Schon. "Kleiner Deutsches Munzkatalog".

3. N.D. Nicol, C.R. Bruce ll. "Standart Catalog of German Coins".

4. C.L. Krause, C.Mishler. "Standart Catalog of World Coins".

5. C.R. Bruce ll. "Unusual World Coins".

6. "Money Trend", "Munzen Review", "Deutsches Munzen Magazine", "World Coin News".