USMAN, B. (2017). Issues and challenges of national security. Klamidas Communications.
Citazione stile Chigago Style (17a edizione)USMAN, Bukar. Issues and Challenges of National Security. Klamidas Communications, 2017.
Citatione MLA (9a ed.)USMAN, Bukar. Issues and Challenges of National Security. Klamidas Communications, 2017.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.