USMAN, B. (2017). Issues and challenges of national security. Klamidas Communications.
Lua i Stíl Chicago (17ú heag.)USMAN, Bukar. Issues and Challenges of National Security. Klamidas Communications, 2017.
Lua MLA (9ú heag.)USMAN, Bukar. Issues and Challenges of National Security. Klamidas Communications, 2017.
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