Who makes Citroen Car Engines?

Citroen makes their own engines in their factory in France. After they purchased Maserati they did use the Maserati engine in some of their cars. As their parent company is Peugeot you might say they use the Peugeot engines but they are identical. They have had joint ventures with Toyota, and Mitsubishi, in other countries outside France where they have used their engines.