\documentclass[a4paper]{article}
\usepackage[brazil]{babel}
\usepackage{lmodern}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{microtype}

\usepackage[
    backend=biber,
    style=../abnt,
    %hyperref,         % Uncomment to turn citations into links
    %backref,          % Uncomment for back references (E.g. "Cit. on p. 1")
    %repeatfields,     % Uncomment to repeat fields instead of using an underscore
    %usedashes,        % Uncomment to use biblatex standard dashes instead of underscores
    giveninits,       % Uncomment to use initials for first names
    uniquename=init,  % When using giveninits only initials can be used for disambiguation
    %bftitles,         % Uncomment to print titles in bold
    %indent,           % Uncomment to use hanging indentation in the bibliography
    %scbib,            % Uncomment to use small caps in the bibliography
    %sccite,           % Uncomment to use small caps in the citations
    %noslsn,           % Uncomment to hide [s.l], [s.n] and [s.l.: s.n.]
    %nosl,             % Uncomment to hide just [s.l]
    %nosn,             % Uncomment to hide just [s.n]
]{biblatex}
\usepackage[brazil]{babel}
\usepackage[autostyle]{csquotes}

\addbibresource{abntex2-doc-abnt-10520.bib}
\addbibresource{abntex2-doc-abnt-6023.bib}
\addbibresource{abntex2-doc-test.bib}
\addbibresource{abntex2-doc.bib}

\begin{document}

	\nocite{*}
	\printbibliography

\end{document}
