I am using the apa6.cls for my document and need a different format of the section headers. I managed to modify the section and subsection header to match my criteria (see below).

But the \subsubsection is still indented and followed by a dot, which I'd like to modify:


(with indention)

In the end, the Subsubsection header should look like


(without indention)



As far as I tried, \noindent did'nt work and i have no idea how to remove the dot.


I really don't know why you want to use the apa6.cls and, most of all, try to change the appearance of the section titles. The class is intended for submissions and not for real typesetting: the format it uses is typographically ugly.

Anyway, here's how you can change the appearance according to your wishes.


\renewcommand{\section}{\@startsection {section}{1}
  {0\baselineskip \@plus 0.2ex \@minus 0.2ex}




\subsubsection{Stimulus material}

Some text following.


enter image description here

  • 1
    The Prof in my psychology course wants us to write our M.Sc. thesis in apa manuscript style, but the specific requirements given differed a bit from the output of the apa6.cls, e. g. concerning the section headers. I considered it easier to build on this .cls though, than adapting the usual latex article class. At least for me as a beginner. The uglyness of the resulting format is nothing I can influence. Anyway, thank you very much, it works very well! – entne Jul 26 '13 at 14:24
  • @entne I am very sorry for your thesis. :( You can always typeset a different version for your enjoyment using a real class. ;-) – egreg Jul 26 '13 at 14:49

You need to redefine the macro \addperi, which sets the period for \subsubsection and \paragraph. Give the below command to change the period for all cases:


This will also remove dot after paragraph heading.

Otherwise you need to rename \addperi command and need to redefine the \subsubsection macro itself like this:

    {0\baselineskip \@plus 0.2ex \@minus 0.2ex}%


  • BTW: I can't find the indentation of C level head. – Jagath Jul 26 '13 at 11:47
  • I am new to LateX, so I have to inquire and add a few things: The paragraph heading is also fine as it is, we are only talking about subsubsection. So I tried your second redefinition. Am I right that this hast to be in the preamble? It removes the dot, but subsubsection is still indented. When I replace \parindent with \noindent, I get several errors concerning my subsubsection and paragraph headings. – entne Jul 26 '13 at 12:21
  • OK. Now got it. Its now corrected. – Jagath Jul 26 '13 at 13:35

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