* [https://books.google.ch/books?id=MFq3DQAAQBAJ&pg=PA117&lpg=PA117&dq=Marlene+Stenten&source=bl&ots=QryQSqy2qD&sig=ACfU3U00f5_LtUxkNB2jyR1t9spgTdK8_w&hl=de&sa=X&ved=2ahUKEwjquKjPmprgAhVJlosKHbqEA4M4ChDoATABegQICRAB#v=onepage&q=Marlene%20Stenten&f=false aus: Hinterlegte Botschaften], S. 109-111 | * [https://books.google.ch/books?id=MFq3DQAAQBAJ&pg=PA117&lpg=PA117&dq=Marlene+Stenten&source=bl&ots=QryQSqy2qD&sig=ACfU3U00f5_LtUxkNB2jyR1t9spgTdK8_w&hl=de&sa=X&ved=2ahUKEwjquKjPmprgAhVJlosKHbqEA4M4ChDoATABegQICRAB#v=onepage&q=Marlene%20Stenten&f=false aus: Hinterlegte Botschaften], S. 109-111 |