KAROUMI, Ammar.
 The Effect of Collective Competition Strategy on Achievement in Mathematics By Special Education Pupils.
<strong>Journal of Tikrit university for humanities - مجلة جامعة تكريت للعلوم الانسانية</strong>, [S.l.], v. 26, n. 9, p. 445-407, nov. 2019.
ISSN 1817-6798. Available at: &lt;<a href="https://jtuh.tu.edu.iq/index.php/hum/article/view/825" target="_new">https://jtuh.tu.edu.iq/index.php/hum/article/view/825</a>&gt;. Date accessed: 15 may 2024.
doi: <a href="http://dx.doi.org/10.25130/hum.v26i9.825">http://dx.doi.org/10.25130/hum.v26i9.825</a>.