https://vocabularyserver.com/udc/en/https://vocabularyserver.com/udc/en/xml.php?skosTema=821Philosophical systems and points of view https://vocabularyserver.com/udc/en/xml.php?skosTema=821 PHILOSOPHY. PSYCHOLOGY BT https://vocabularyserver.com/udc/en/xml.php?skosTema=821 Kinds of viewpoint NT https://vocabularyserver.com/udc/en/xml.php?skosTema=821 Possible philosophical attitudes. System typology NT