A collection of sources:
1. Orthodox Witness Concerning Catholicism
2. Catholicism (vera pravoslavnaya)
3. On Papism, Two books by Fr Vladimir Guetee
4. My Exodus From Roman Catholicism by His Grace Bishop of Nazianzus Paul de Ballester
5. Archimandrite George (Kapsanis) Orthodoxy and humanism. Orthodoxy and papism
6. Archimandrite Emmanuel (Kalivas) Condemnation of the Papacy
7. Protopresbyter Mikhail Pomazansky "Keep what you have"
8. St Mikhail Novoselov on Catholicism
You can translate the sites into your preffered language using google translator.
