Kohler, Klaus. 1990. Illustrations of the IPA: German. Journal of the International Phonetic Association 20. 48–50. Cambridge University Press.
@article{deu_kohler1990,
author = {Kohler, Klaus},
journal = {Journal of the International Phonetic Association},
number = {1},
pages = {48–50},
publisher = {Cambridge University Press},
title = {Illustrations of the IPA: German},
volume = {20},
year = {1990}
}