(2019). Certificate No. 18. Journal of higher education curriculum studies, 9(18), 1-6.

. "Certificate No. 18", Journal of higher education curriculum studies, 9, 18, 2019, 1-6.

(2019). 'Certificate No. 18', Journal of higher education curriculum studies, 9(18), pp. 1-6.

, "Certificate No. 18," Journal of higher education curriculum studies, 9 18 (2019): 1-6,

Certificate No. 18. Journal of higher education curriculum studies, 2019; 9(18): 1-6.