Heinkel, E., & Thorwald, J. (1956). He 1000: Ernst Heinkel. Ed. by Jürgen Thorwald. Hutchinson.

Heinkel, Ernst, and Jürgen Thorwald. He 1000: Ernst Heinkel. Ed. by Jürgen Thorwald. London: Hutchinson, 1956.

Heinkel, Ernst, and Jürgen Thorwald. He 1000: Ernst Heinkel. Ed. by Jürgen Thorwald. Hutchinson, 1956.