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Many thanks Johannes! I will try and see what happens.

Hello Johannes,

How does it look the following MWE:
preamble:
\usepackage{apacite}
\bibliographystyle{apacite}
\renewcommand{\BBAA}{y} % between authors in parenthetical cites and ref. list
\renewcommand{\BBAB}{y} % between authors in in-text citation
\renewcommand{\BAnd}{y} % for ``Ed. \& Trans ...

Sorry, bibliography style was with %, sorted out, was my fault.
From the two solutions provided in your last link I find much easier to install apacite with the renewcommand changing the conjunction I (catalan) for the Spanish Y. Thanks for the link!

Good morning Johannes,
Thanks for the link, I will try to switch to apacite and see.

However, I have now a new issue. I have canceled all new codes from yesterday and therefore I have configured tex maker again to work with natbib. It was only 2 steps: options, configure tex maker and in commands ...

Good night Johannes,
Right now, with biblatex installed I compile the following
@book{sanmartiysantacana2005,
title={Els ibers del nord},
author={Sanmartí,­ Joan y Santacana, Joan},
publisher={Editorial Dalmau},
year={2005}
}

and the bibliography does not appear, and in the text the reference ...

Really sorry Johannes.Please, accept my apologies. I know now that I have made a mistake. What can I do now? I guess that the best thing to do is to cancel all packages and codes installed today and start again tomorrow.
Really hope you can help me tomorrow.

Hello again, I am really desperate. I managed to install biblatex but now I get the following warning:
INFO - This is Biber 2.12 INFO - Logfile is 'thesis ordenes.blg' INFO - Reading 'thesis ordenes.bcf' ERROR - Error: Found biblatex control file version 3.6, expected version 3.5. This means that ...

Hello again Johannes,
I have tried to install the above packages and it doesn't do it, it keeps saying in red log error file
When I installed the natbib package I had actually the same problem, I did have to try various times before It was installed. Should I do the same now?

Thanks in advance!

does it look better (after some research I found this commands):
\usepackage[spanish]{babel}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[style=apa,natbib=true,backend=biber]{biblatex}
\DeclareLanguageMapping{spanish}{spanish-apa}
\DefineBibliographyExtras{spanish}
{\setcounter ...

Have look to what I am going to do and let me know please if it looks fine Johannes:

preamble:
\usepackage[backend=biber,style=apa,autocite=inline]{biblatex}% style=apa, I guess is the equivalent to apalike
\addbibresource{davidtesis.bib}%this should be the new file that I am going to create for my ...