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Beckett, A. H.; Shellard, E. J.; Tackie, A. N. (December 1963). "The Mitragyna Species of Ghana. The Alkaloids of the Leaves of Mitragyna Ciliata Aubr. Et Pellegr". The Journal of Pharmacy and Pharmacology. 15: Suppl 166–169. doi:10.1111/j.2042-7158.1963.tb11206.x. PMID14101604. S2CID10741027.
Beckett, A. H.; Shellard, E. J.; Tackie, A. N. (December 1963). "The Mitragyna Species of Ghana. The Alkaloids of the Leaves of Mitragyna Ciliata Aubr. Et Pellegr". The Journal of Pharmacy and Pharmacology. 15: Suppl 166–169. doi:10.1111/j.2042-7158.1963.tb11206.x. PMID14101604. S2CID10741027.