@book{Portmann, author = {Portmann, Adolf}, title = {Um das Menschenbild, Stuttgart (Philipp Reclam Jun.) 1970.}, language = {de} } @book{Portmann, author = {Portmann, Adolf}, title = {Biologie als technische Weltmacht, Z{\"u}rich (Verlag der Arche) 1970.}, language = {de} } @book{Portmann, author = {Portmann, Adolf}, title = {Entl{\"a}ßt die Natur den Menschen?, M{\"u}nchen (R. Piper \& Co Verlag) 1970.}, language = {de} }