Anand Krishna Singh, Jaya Joshi and Rameshwar Jatwa 2013. Dipeptidyl peptidase IV (DPP-IV/CD26) inhibitory and free radical scavenging potential of W. somnifera and T. foenum-graecum extract. International Journal of Phytomedicine. 5, 4 (Dec. 2013), 503–509.