English Name
Time
Link
Details from Source
NSP
Manifesto Project
ParlGov
EJPR PDY
NUORS
Wikipedia tags
World Values Survey
NUSU
EU-NED
IPOD
YoFiPa
PIP
Ray (1999)
YOUNG
NPPSI
YF
added: July 8, 2018, 7:44 p.m. — updated: Dec. 15, 2023, 12:09 p.m.