Present participle; Past participle - referencing - referenced Present - reference - reference - references - reference - reference - reference Past - referenced - referenced - referenced - referenced - referenced - referenced Future - will reference - will reference - will reference - will reference - will reference - will reference Present conditional - would reference - would reference - would reference - would reference - would reference - would reference Present Perfect - have referenced - have referenced - has referenced - have referenced - have referenced - have referenced Past Perfect - had referenced - had referenced - had referenced - had referenced - had referenced - had referenced Future Perfect - will have referenced - will have referenced - will have referenced - will have referenced - will have referenced - will have referenced Past conditional - would have referenced - would have referenced - would have referenced - would have referenced - would have referenced - would have referenced Imperative - - - reference - - - - - - - -