Schweinfurth, Ulrich. “Gunung Mulu National Park, Sarawak - Die Gunung Mulu-Expedition Der Royal Geographical Society”. ERDKUNDE 36, no. 3 (September 30, 1982): 209–212. Accessed October 7, 2024. https://journals-test.ulb.uni-bonn.de/index.php/erdkunde/article/view/1986.