Khaleghi, A. (2003). European Police Office (Europol). Journal of Legal Research, 2(3), 263–267.

Khaleghi, A. "European Police Office (Europol)", Journal of Legal Research, 2, 3, 2003, 263–267.

Khaleghi, A. (2003). 'European Police Office (Europol)', Journal of Legal Research, 2(3), pp. 263–267.

Khaleghi, A., "European Police Office (Europol)." Journal of Legal Research, 2 3 (2003): 263–267,

Khaleghi A. European Police Office (Europol). Journal of Legal Research. 2003;2(3):263–267 (In Persian).