1. Andžāns, M., Bruģe, I. and Sprūds, A. (2017) Psiholoģiskā aizsardzība Latvijā: ievainojamības un iespējas [Psychological defence in Latvia: vulnerabilities and oppurtunities]. Riga: Latvian Institute of International Affairs.
2. Andžāns, M. and Sprūds, A. (forthcoming) ‘Three Decades’ Evolution of Willingness to Defend One’s Own Country: the Case of the Baltic States’, Lithuanian Annual Strategic Review.
3. Bērziņa, I. and Zupa, U. (2020) Latvijas sabiedrības griba aizstāvēt valsti: veicinošie un kavējošie faktori [Willingness to defend the state in Latvian society: promoting and inhibiting factors]. Riga: National Defence Academy of Latvia. Center for Security and Strategic Research. Available at: https://www.naa.mil.lv/sites/naa/files/document/DSPC_GribaAizstavetValsti_0.pdf (Accessed: 1 March 2020).
4. European Values Study (2013b) EVS 1999 - Variable Report Integrated Dataset. European Values Study and GESIS Data Archive for the Social Sciences. Available at: https://dbk.gesis.org/dbksearch/file.asp?file=ZA3811_cdb.pdf (Accessed: 1 March 2020).