"I used all the methods I could think of - some perhaps ethically questionable. I tiptoed about the village trying to observe whilst remaining unobserved; I recorded with the knowledge of all participants, or with the knowledge of none, or withe the knowledge of one participant only. I also put direct questions about linguistic behaviour to informants and then cross-checked." (N.D. 1969a: 558)
Karl Sornig
Linguistik Mehrsprachigkeit Spracherwerb Sprachkontakt Sprachverwendung