G. N. Pathan, and P. H. Bhathawala. “A Mathematical Model for Unemployment Control-An Analysis With and Without Delay”. International Journal of Mathematics And its Applications 6, no. 1 - A (January 1, 2018): 83–93. Accessed May 17, 2024. http://ijmaa.in/index.php/ijmaa/article/view/900.