Bioaktivitas Ekstrak Daun Tapakdara (Catharanthus roseus) terhadap Kadar Kreatinin dan Kadar Ureum Darah Tikus Putih (Rattus norvegicus) - Laksmi, Ni Luh Gede Merry Cintya (The Faculty of Veterinary Medicine, Udayana University, 2014)