Ok, I'll try, but I don't know what will came out, so please, don't use this code until someone confirms it. Files are from Wordbook 1.15beta2.
entry.php and admin/entry.php
change line 150 from
$thisterm['ref'] = $myts -> makeTboxData4Show( $ref );
$thisterm['ref'] = $myts -> displayTarea( $ref, $html, $smiley, $xcodes, 1, $breaks );
include/storyform.inc.php
change line 37 form
$sform -> addElement( new XoopsFormTextArea( _MD_WB_REFERENCE, 'ref', $ref, 5, 50 ), false );
$sform -> addElement( new XoopsFormDhtmlTextArea ( _MD_WB_REFERENCE, 'ref', $ref, 15, 50 ), false );
admin/submissions.php
change line 89 from
$sform -> addElement( new XoopsFormTextArea( _AM_WB_ENTRYREFERENCE, 'ref', $ref, 5, 60 ), false );
$sform -> addElement( new XoopsFormDhtmlTextArea( _AM_WB_ENTRYREFERENCE, 'ref', $ref, 15, 60 ), false );