Citazione Stile APA (7a Edizione)
Holas, L. Security environment at the turn of 20th and 21st century.
Citazione stile Chigago Style (17a edizione)
Holas, Lukáš. Security Environment at the Turn of 20th and 21st Century.
Citatione MLA (9a ed.)
Holas, Lukáš. Security Environment at the Turn of 20th and 21st Century.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.