Bullying and cyberbullying in Polish elementary and middle schools: Validation of questionnaires and nature of the phenomena

ROSARIO ORTEGA RUIZIZABELA ZYCH2026-01-292026-01-29201810.1016/j.childyouth.2018.10.0452-s2.0-85056154353https://www.scopus.com/inward/record.uri?eid=2-s2.https://ucocris.uco.es/handle/123456789/29758Developmental and Educational PsychologyEducationSociology and Political ScienceBullying and cyberbullying in Polish elementary and middle schools: Validation of questionnaires and nature of the phenomenaresearch article