00420nam a2200145   4500020001800000082002000018100002300038245007200061250001200133260003500145300001000180650002100190650004800211650001500259  a9789393969934  aM 001.42bRAV/A  aRavi Sankar S Nair  aAarum vaaykaatha pusthakam engane ezhuthaam/cby Ravi Sankar S Nair  a3rd ed.  aKozhikode:bAtma books,c2023.  a267p.  aResearch methods  aResearch, evaluation, and scientific method  a Knowledge