Said Nazaruddin, Abdullah, M. Ali. S and Jalaluddin 2021. MORPHOLOGY CHARACTERISTICS OF SWIFTLET’S NEST NATURAL HABITATS (CAVE) IN GUNONG PUNGKI TADU RAYA THE DISTRICT NAGAN RAYA. Researchers World - International Refereed Social Sciences Journal. 6, 4 (Sep. 2021), 93–100.