Engel, P. (2009). Research in Book and Paper Conservation in Europe - a state of the Art -. Berger.
Chicago-Zitierstil (17. Ausg.)Engel, Patricia. Research in Book and Paper Conservation in Europe - a State of the Art -. Horn/Wien: Berger, 2009.
MLA-Zitierstil (8. Ausg.)Engel, Patricia. Research in Book and Paper Conservation in Europe - a State of the Art -. Berger, 2009.
警告：这些引文格式不一定是100％准确.