@book{2020,
url = {https://doi.org/10.3790/9783428433421},
title = {Erfolgskontrolle im Marketing},
title = {},
author = {},
publisher = {Duncker & Humblot},
address = {},
doi = {doi:10.3790/9783428433421},
isbn = {9783428433421},
year = {1975},
lastchecked = {2020}
}