Viqar Uddin Ahmed, Talat Zamir, Naim M. Hassan, Hamid-ul-Qadir, and H.E.J, “STUDIES ON THE ESSENTIAL OIL OF PEROVSKIA ABROTANODES”, Sindh. Uni. Res. J. SS, vol. 25, no. (1&2) 1993 issued Sep, Dec. 2025.