@book{2021,
url = {https://doi.org/},
title = {Handbuch Messe-, Kongress- und Eventmanagement},
title = {},
author = {},
publisher = {Edition Wissenschaft & Praxis},
address = {},
doi = {doi:},
isbn = {9783896445971},
year = {2021},
lastchecked = {2021}
}