1. American Psychology Association (APA). (n.d.‐a) Hope.https://dictionary.apa.org/hope
2. American Psychology Association (APA). (n.d.‐b) Optimism.https://dictionary.apa.org/optimism
3. Annex V. (2021)Comparative focus groups. In B&G/PPMI/PD‐PCF UCAnalysis of EU External Perceptions: Update Study 2021 FPI file://file/Usersn$/nch45/Home/Downloads/Update%20of%20the%202015%20Perception%20Study %20Annexes%20to%20the%20Main%20Report.pdf
4. B&G/PPMI/PD‐PCF UC. (2021)Analysis of EU External Perceptions: Update Study 2021 FPI.https://ec.europa.eu/fpi/key‐documents_en?f%5B0%5D=document_title%3Aupdate