found: His Elemente des barocken Trauerspiels, 1959.
found: Dies und dass, c1995:t.p. (Herbert Heckmann)
found: DDB Web OPAC, May 10, 2007(Heckmann, Herbert, 1930-1999)
found: Benjamin und seine Väter, 2017:title page (Herbert Heckmann)
found: German Wikipedia, viewed May 10, 2017:Herbert Heckmann (born Sept. 25, 1930 in Frankfurt am Main, died Oct. 18, 1999, in Bad Vilbel; German writer and university lecturer; became vice-president of the Deutsche Akademie für Sprache und Dichtung in 1982, and president from 1984 to 1996)