
German Helmets 1933-1945: A Collector's Guide: Goodapple,

Amazon.com: Germany's Combat Helmets - 1933 - 1945: A Modern,

Wehrmacht Combat Helmets 1933–45: : Elite Brian C Bell,

20 Years of Collecting - German Helmets - TR HELMETS - World,

German Helmets of the Second World War (WWII) Vol 2,

Amazon.com: German Style Motorcycle Helmet, DOT Approved,

Amazon.com: Motorcycle Helmet German Style Half Helmet Skull,

20 Years of Collecting - German Helmets - TR HELMETS - World,

Helmets Archives - Time Traveler Militaria,

German Helmet Vault – Collecting German WW2 helmets