@book{Volkens:2015,
Address = {Berlin},
Author = {Volkens, Andrea AND Lehmann, Pola AND Matthieß, Theres AND Merz, Nicolas AND Regel, Sven AND Werner, Annika},
Publisher = {Wissenschaftszentrum Berlin für Sozialforschung},
Title = {The Manifesto Data Collection. Manifesto Project (MRG/CMP/MARPOR). Version 2015a},
doi = {10.25522/manifesto.mpds.2015a},
url = {https://doi.org/10.25522/manifesto.mpds.2015a},
Year = {2015}