References Der Jasager

sources

amadeus almanac, accessed 31 october 2008
hinton, stephen. 1992. jasager, der . in new grove dictionary of opera. ed. stanley sadie. london:. isbn 0-333-73432-7.
squiers, anthony. introduction social , political philosophy of bertolt brecht: revolution , aesthetics. amsterdam: rodopi. 2014. isbn 9789042038998.
weill, kurt. 1930. interview. in collected plays: 3 bertolt brecht. ed. , trans. john willett. brecht collected plays ser. london: methuen, 1997. isbn 978-0-413-70460-3. pp. 334–335