@book{Merk+2023,
url = {https://doi.org/10.3790/9783428410224},
title = {Wissenschaftliche Marktforschung},
title = {},
author = {Gerhard Merk},
publisher = {Duncker & Humblot},
address = {},
doi = {doi:10.3790/9783428410224},
isbn = {9783428410224},
year = {1962},
lastchecked = {2023}
}