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lang-tex
\nocite{*}which is already discussed in the other answer. Apart from that I can't see the need to loadetoolboxin this particular example. You also have\bibliographystyletwice (which is probably not an error on the LaTeX side, but BibTeX doesn't like that). Plusnatbibandapaciteshould ideally not be used together like this (they can be used together, but then that should be done with\usepackage[natbibapa]{apacite}). ...\usepackage{breakurl}is not recommendable with all toolchains (I'd say it's only useful in a minority of cases). Generally it is recommended to loadhyperreflast (subject to a few documented exceptions; I'm not aware thatnatbibis such an exception).