- E-bookPsycho-Spiritual Dialectics & TherapyConstantin Portelli
- E-bookMetaphysics of HistoryConstantin Portelli
- E-bookModern Universal Christian ReligionConstantin Portelli
- E-bookApocalypse Modern MeaningConstantin Portelli
- E-bookTherapy by Modern ReligionConstantin Portelli
- E-bookSearching God in Modern WorldConstantin Portelli
- E-bookModern Christian DecalogueConstantin Portelli