Al-Shammary, Aziz M., and Ammar S. AL- Diyny. “THE EFFECT OF IRRIGATION PERIOD AND PLANT DENSITY IN SOME QUANTITATIVE CHARACTERS FOR VARIETIES OF COWPEA (Vigna Sinensis L.) ”. Diyala Agricultural Sciences Journal , vol. 9, no. 2, Dec. 2017, pp. 180-92, https://journal.djas.uodiyala.edu.iq/index.php/dasj/article/view/1310.