- University of Split Library Catalog
- University of Zagreb, Catholic Faculty of Theology Catalog
- Central archdiocesan and university library of the Catholic Theological Faculty in Đakovo
- The Faculty of Philosophy and Religious Studies Library „Juraj Habdelić“ – Zagreb
- Croatian National and University Library Catalog - Zagreb
- HRČAK – Portal of Croatian scientific and professional journals
- The Holy See
- Catholic Research Resources Alliance (CRRA)
- Open Access Digital Theological Library
- BETH