ENGEL, Henk et al.
Foreword.
OverHolland, [S.l.], p. 1-2, mar. 2017.
ISSN 1574-3160. Available at: <https://journals.open.tudelft.nl/overholland/article/view/1663>. Date accessed: 26 jan. 2021.
doi: https://doi.org/10.7480/overholland.2014.14-15.1663.