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The PreTeXt Guide

Section 30.8 Cross-References

In an electronic PDF, cross-references will be hyperlinks that take the reader to the target. Color is used to make them visible, in addition to whatever indication a PDF viewer will provide on hover. The publication file entry controlling the use of numbers in cross-references (Subsection 44.3.7) is by default no in this case, but may be set to yes to include the page number of the target in the cross-reference.
In a print PDF, cross-references will not be active hyperlinks and will be the same color as the adjoining text. The publication file entry controlling the use of numbers in cross-references (Subsection 44.3.7) is by default yes in this case, but may be set to no to not include the page number of the target in the cross-reference.
See Subsection 44.3.7 for the syntax of specifying the use of page numbers in cross-references.