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My hint may not solve your problem, but a change from apacite to biblatex-apa is not only recommended, it also keeps the capitalization in the header.
I've already told the OP, that using biblatex + biber would be recommended, this it seems the OP does not want to change his packages.
Thanks a ...

Dear Ijon, thanks for your suggestions. Although the packages might be adapted due to several single problems I had to resolve, the result is quite satisfying.
The only problem left is that I cannot change the running head of the bibliography section, irrespective where I place the \markboth.

Thanks for your reply. Here is my basic code.

\documentclass[11pt]{book}

\usepackage{scrpage2}
\usepackage[paperwidth=176mm,paperheight=246mm]{geometry}
\setlength{\textheight}{19.5cm}
\setlength{\footskip}{8mm}
\setlength{\parindent}{0pt}
\setlength{\textwidth}{12.5cm}
\setlength{\evensidemargin ...

Hi, i am in despair with the customization of the running header in my Phd thesis. Specifically, I want to change the running header of the reference list. All running heads appear in capital letters (as intended), except for the bibliography chapter.

The following code does not work to adjust the ...