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.
Trích dẫn kiểu Chicago (xuất bản lần thứ 7)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.
Trích dẫn kiểu MLA (xuất bản lần thứ 8)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.
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