usaria o biblatex:
% Pacotes de citações BibLaTeX
% ----------------------------------------------------------
\usepackage[style=abnt,
backref=true,
backend=biber,
citecounter=true,
backrefstyle=three,
url=true,
maxbibnames=99,
mincitenames=1,
maxcitenames=2,
backref=true,
hyperref=true,
giveninits=true,
uniquename=false,
uniquelist=false]{biblatex}
% Norma NBR10.520/2023 - Sobrenomes em minúsculas
\renewcommand*{\mkbibnamefamily}[1]{#1}%
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No preambulo colocaria ainda o arquivo de referencias no formato .bib
% ----------------------------------------------------------
\addbibresource{referencias.bib}
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E no postextual , para imprimir as referências
\printbibliography
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