Beltrame, F. L.; Filho, E. R.; Barros, F. A. P.; Cortez, D. A. G.; Casset, Q. B. (2006). «A validated higher-performance liquid chromatography method for quantification of cinchonain Ib in bark and phytopharmaceuticals of Trichilia catigua used as Catuaba». Journal of Chromatography A1119 (1–2): 257-263. PMID16360665. doi:10.1016/j.chroma.2005.10.050.
Beltrame, F. L.; Filho, E. R.; Barros, F. A. P.; Cortez, D. A. G.; Casset, Q. B. (2006). «A validated higher-performance liquid chromatography method for quantification of cinchonain Ib in bark and phytopharmaceuticals of Trichilia catigua used as Catuaba». Journal of Chromatography A1119 (1–2): 257-263. PMID16360665. doi:10.1016/j.chroma.2005.10.050.