ZBAR, Khaled.
 The effect of Strategy (PQ4R) on acquiring Islamic concepts and improving Investigation  Skills among intermediate stage students in Iraq.
<strong>Journal of Tikrit university for humanities - مجلة جامعة تكريت للعلوم الانسانية</strong>, [S.l.], v. 26, n. 11, p. 534-511, dec. 2019.
ISSN 1817-6798. Available at: &lt;<a href="https://jtuh.tu.edu.iq/index.php/hum/article/view/883" target="_new">https://jtuh.tu.edu.iq/index.php/hum/article/view/883</a>&gt;. Date accessed: 11 may 2024.
doi: <a href="http://dx.doi.org/10.25130/hum.v26i11.883">http://dx.doi.org/10.25130/hum.v26i11.883</a>.