I can provide a small code you should be able to compile. It is using biblatex and biber. I will compile several times if your system is configures to do so, or do it manually. See how the different ways of citing works with multiple authors.
% !TeX TS-program = pdflatex
\documentclass[12pt, a4paper]{article}
\usepackage[english]{babel}
\usepackage[%
backend=biber,
natbib=true,
style=apa,
]{biblatex}
\begin{filecontents*}[overwrite]{\jobname35.bib}
@book{companion,
author = {Goossens, Michel and Mittelbach, Frank and Samarin, Alexander},
title = {The \LaTeX\ {C}ompanion},
date = 1994,
edition = 1,
publisher = {Addison-Wesley},
location = {Reading, Mass.},
pagetotal = 528,
}
@article{aksin,
author = {Aks{\i}n, {"O}zge and T{"u}rkmen, Hayati and Artok, Levent
and {\c{C}}etinkaya, Bekir and Ni, Chaoying and
B{"u}y{"u}kg{"u}ng{"o}r, Orhan and {"O}zkal, Erhan},
title = {Effect of immobilization on catalytic characteristics of
saturated {Pd-N}-heterocyclic carbenes in {Mizoroki-Heck}
reactions},
journaltitle = {{S}eminars in {N}uclear {M}edicine},
date = 2006,
volume = 691,
number = 13,
pages = {3027-3036},
indextitle = {Effect of immobilization on catalytic characteristics},
}
@article{bertram,
author = {Bertram, Aaron and Wentworth, Richard},
title = {Gromov invariants for holomorphic maps on {Riemann} surfaces},
journaltitle = {Revue d'Histoire Eccl{'e}siastique},
date = 1996,
volume = 9,
number = 2,
pages = {529-571},
langid = {english},
langidopts = {variant=american},
shorttitle = {Gromov invariants},
}
\end{filecontents*}
\addbibresource{\jobname35.bib}
\begin{document}
\section*{Introduction}
Two topics that I wish were taught more often are equivalence testing \citep{aksin} and ROC curves \citep{bertram}. Such methods are well supported by software \citep{aksin, companion}. That said, I confess that the cited software products have nothing to do with the topics that are mentioned.
\citet{bertram} presents some methodology on how to perform tests of equivalence,and also the one--sided versions of these, which are known as non-inferiority or non--superiority tests. On the other hand, if you want to know about receiver operating characteristic (ROC) curves, a good source of information is \citet{companion}.
\printbibliography
\end{document}

Recommended! https://tex.stackexchange.com/a/527526/161015
apacitebibliography style, you need to load theapacitepackage too, and if you plan to use thenatbibcitation commands, you need to load it with thenatbibapaoption. I'm not sure thatapaciteimplements APA 7, however, so you may want to switch tobiblatex-apawhich does. – Alan Munn Dec 16 '20 at 15:38apacitecurrently can only give you 6th-ed. APA style. (And as Alan commented above, you should load\usepackage{apacite}to properly useapacite.) If you need 7th-ed. APA style, the only LaTeX-based solution at the moment is a current version ofbiblatex-apa(which will likely require small changes to your workflow). – moewe Dec 17 '20 at 08:01