P. Sieńko, I. Biernacka – Ligięza, Critical Infrastructure Protection vs. National Security Strategy (2005-2015) – prepared for printing in 2023

P. Sieńko, Methods of securing and controlling critical infrastructure assets allocated in Information And Communications Technology (ICT) sector companies in leading European Union countries, Securitologia, ISSN: 1898-4509, nr 2/2015, str. 107-123

P. Sieńko, Legal aspects of protection and control of strategic state resources accumulated in commercial companies significant for national security and public order, Securitologia, ISSN: 1898-4509, nr 2/2014, str. 37-53

P. Sieńko, Russian policy of pretexts vs. Article 5 of The North Atlantic Treaty – threats and defence possibilities, Securitologia, ISSN: 1898-4509, nr 1/2014, str. 47-65

P. Sieńko, E. Pasternak, „Media communication as part of a country’s information policy in times of democracy”, w: „Media And Democratization”, I. Biernacka-Ligięza (red), Wyd. A. Marszałek, Toruń 2013, str. 65 – 98

P. Sieńko, Norwegian air defence systems – international economic cooperation in regional security system, The Polish Strategy Institute (internal paper, 2011)

P. Sieńko, Turkey – the Eurasian leader in South Corridor, The Polish Strategy Institute (internal paper, 2011)

D. Chirek, T. Czaplak, J. Urbanowicz, P. Sieńko, Analysis of threats to state security in relation to critical telecommunications infrastructure, The Polish Strategy Institute (April 12, 2011)

D. Chirek, T. Czaplak, J. Urbanowicz, P. Sieńko, Analysis of the security of telecommunications networks of critical infrastructure in connection with the planned privatization of telecommunications operators, The Polish Strategy Institute (January 20, 2011)