Weber, M. (1926). Politik als Beruf. München: Duncker & Humblot. https://nbn-resolving.org/urn:nbn:de:0168-ssoar-59888-1 pdf 
The modern understanding of a profession in technical-industrial societies is based on the monopolization of specialized skills, which are learned through (mostly institutionalized) educational processes and are geared toward permanent gainful employment. Whether literary work can be called a profession in this respect is questionable. (Carolin Amlinger, Schreiben, p. 19)