↑Jentsch J, Meierkord S, Hammer M. The enzymes from carnivorous plants (Nepenthes): Properties and characterization of the acid protease nepenthacin. Planta Medica. 1989, 55: 227. doi:10.1055/s-2006-961979.
↑Amagase S, Mori M, Nakayama S. Digestive enzymes in insectivorous plants. IV. Enzymatic digestion of insects by Nepenthes secretion and Drosera peltata extract: proteolytic and chitinolytic activities. J. Biochem. 1972-09, 72 (3): 765–7. PMID 4634982.
↑Tökés ZA, Woon WC, Chambers SM. Digestive enzymes secreted by the carnivorous plant Nepenthes macferlanei L. Planta. 1974-03, 119 (1): 39–46. doi:10.1007/BF00390820.
↑Athauda SBP, Inoue H, Iwamatsu A, Takahashi K. Acid Proteinase from Nepenthes distillatoria (Badura). James, Michael (编). Aspartic proteinases: retroviral and cellular enzymes. New York: Plenum. 1998: 453–458. ISBN 0-306-45809-8.
↑Kubota K, Metoki Y, Athauda SBP, Shibata C, Takahashi K. Stability Profiles of Nepenthesin in Urea and Guanidine Hydrochloride: Comparison with Porcine Pepsin A. Bioscience, Biotechnology, and Biochemistry. 2010, 74 (11): 2323–2326. doi:10.1271/bbb.100391.