Edkins, D. (1981). The Prussian Orden Pour le Mérite: History of the Blue Max ; a study of the famous Blue Max and the men who won it from its earliest beginnings through World War I. Ajay Enterprises.

Edkins, David. The Prussian Orden Pour Le Mérite: History of the Blue Max ; a Study of the Famous Blue Max and the Men Who Won It from Its Earliest Beginnings Through World War I. Falls Church, VA: Ajay Enterprises, 1981.

Edkins, David. The Prussian Orden Pour Le Mérite: History of the Blue Max ; a Study of the Famous Blue Max and the Men Who Won It from Its Earliest Beginnings Through World War I. Ajay Enterprises, 1981.