Hm, I made this little test:

+++
\startbuffer[references]
@misc{test,
 author= {P. Wolf and H. Fuchs and V. Hase and L. Löwe},
 title = {Irgendwelche Viecher},
 year = {2017},
}
\stopbuffer

\usebtxdataset[references.buffer]
\usebtxdefinitions[aps]

\setupbtx
[apa:list:author]
[separator:3={\btxnobreakspace\textampersand\space}] % last of a list

\starttext

\cite[test]

\placelistofpublications

\stoptext
+++

but this damn comma is still there:

[1] P. Wolf, H. Fuchs, V. Hase, and L. Löwe, Irgendwelche Viecher, (2017).




——
tobias berndt
      (dipl.-kfm., mba)

   t : 0176.56 75 15 30
   m : tobiasberndt@arcor.de
   e : t = telefon, m = mail, e = erklaerung 


On Mittwoch, Nov. 08, 2017 at 6:24 PM, tobber <tobiasberndt@arcor.de> wrote:
Hey Alan,

where I have to put the code:

\setupbtx
[apa:list:author]
[separator:3={\btxnobreakspace\textampersand\space}] % last of a list

??





——
tobias berndt
      (dipl.-kfm., mba)

   t : 0176.56 75 15 30
   m : tobiasberndt@arcor.de
   e : t = telefon, m = mail, e = erklaerung 


On Mittwoch, Nov. 08, 2017 at 6:10 PM, Alan Braslau <braslau.list@comcast.net> wrote:
\setupbtx
[apa:list:author]
[separator:3={\btxnobreakspace\textampersand\space}] % last of a list

(But note that the "Oxford" comma is now not only officially accepted,
but it is also part of the APA specification, often not fully
respected.)

Alan



On Wed, 8 Nov 2017 13:49:23 +000
Tobias Berndt <Tobias.Berndt@baramundi.de> wrote:

Dear List,

since I am typesetting a German publication, I wanna get out the
comma before and:

R. Smith, F. Bauer, J. Faulkner, & J. Joyce (1966). Blabla ... and it
should be: R. Smith, F. Bauer, J. Faulkner & J. Joyce (1966).
Blabla ...

My settings are more or less:

\usebtxdataset[bla-publications.bib]
\usebtxdefinitions[apa]

+++

\startchapter[reference=chap:7,title={Literaturverzeichnis}]
\placelistofpublications
\stopchapter

+++

@Article{kri15,
author = {B. Kriesche and R. Hess and B. Reichert and
V. Schmidt}, journal = {Spatial Statistics},
pages = {15\,--\,30},
title = {A probabilistic approach to the prediction
of area weather events, applied to precipitation}, volume = {12},
year = {2015}}

+++

Any idea?

ALOHA, tobber

Mit freundlichen Gr??en

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