Some of your .bib entries are of poor quality and contain mistakes including
- missing commas to separate field, duplicate entries (e.g. pwc entry)
- incorrect/inconsistent capitalization of titles and authors
- incorrect field delimiters (e.g. schneider entry)
- entries with math symbols, but no math environment (e. g. Demerouti2004 has the title
title = {The impact of shiftwork on work{\mkern1mu}{\textendash}{\mkern1mu}home conflict, job attitudes and health}
[I guess you want The impact of shiftwork on work -- home conflict, job attitudes and health
or maybe even a ---
]
- inconsistent page numberings (most have
x--y
, some entries have x - y
- missing fields (e.g. abo2020 is missing journal+pages; the exported bib entries from the doi contains the journal)
- other issues (in Mustofa_2020 almost all authors are incorrectly abbreviated)
- incorrect URLs (e.g. who; any URL with an
_
outside an \url{}
environment will cause the math mode to start)
I used a different bibliography style but these entries lead to the same mistakes. As a side note, if you set \usepackage[utf8]{inputenc}
you do no longer need to escape characters like ä, ö, ü, ß, é, etc. in the bibliography.