"authentic work" is a perfectly valid phrase that can be used in written English.
For example, you might say: "I'm proud to have produced an authentic work of art that I can call my own."
"We are drawn to the authentic work," he said.
"People are interested in authentic work," he said.
"It's to give kids more challenging, rich and authentic work".
The serious authentic work of the year in fiction came from some giant truth tellers.
Each option has drawbacks, including the possibility of mistakenly destroying an authentic work.
Or consider a reverse case: you're told that an authentic work is a forgery.
"Eragon," for all its flaws, is an authentic work of great talent.
A genuine patterned Fair Isle jumper is considered an authentic work of art.
"Lust," in its various forms and compounds, occurs 95 times in Shakespeare's authentic work.
This is authentic work, driven by the teachers, not by some external body.
And I give credit for any additional authentic work they add.
