BibTeX, biblatex and biber ⇒ Natbib in-text ( \citet*{} ) uses "&" instead of "and"

[psyxcience]

Hi,
I have problems with "natbib" (I guess, I'm not so familiar with this, so the problem could be elsewhere).

APA style requires author-in-text citations to be separated by an "and" instead of the "&". According to the natbib-documentation this should automatically be done when using \citet*{}. However it doesn't work. "&" is used. This is a basic version of my file:

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\documentclass[man]{apa}

\usepackage[sort]{natbib}
%\usepackage{apalike}    % I tried this but it doesn't have an effect

\begin{document}

in-text should be with "and" \citet*{martiny-huenger_distractor_2013} and in parentheses should be with "\&" \citep*{martiny-huenger_distractor_2013} blabla

%\bibliographystyle{plainnat}    % also no obvious effect
\bibliography{bibtex_file}

\end{document}

I get "Martiny-Huenger, Gollwitzer, & Oettingen (2013)" for the first citation instead of "Martiny-Huenger, Gollwitzer, and Oettingen (2013)".

In the bibtex_file I have this:

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@article{martiny-huenger_distractor_2013,
	title = {Distractor Devaluation in a Flanker Task: Object-Specific Effects Without Distractor Recognition Memory.},
	doi = {10.1037/a0034130},
	journal = {Journal of Experimental Psychology: Human Perception and Performance},
	author = {Martiny-Huenger, Torsten and Gollwitzer, Peter M. and Oettingen, Gabriele},
	year = {2013}
},

I would appreciate any comments. Tell me if you need more information.
Thanks,
Torsten