To refer to other sections or chapters within a manual, use the <xref> tag.

The output of this displays the title of the section or chapter you are pointing the user to. For example:

For more information about the parent file, refer to
<xref linkend="ch-tutorial"></xref> and <xref linkend="s1-tutorial-parent"></xref>

The output:

For more information about the parent file, refer to Chapter 7, The Layout of a Tutorial and Section 7.1, “The Parent File”.