^ abHerraiz, T; Chaparro, C (2006). “Human monoamine oxidase enzyme inhibition by coffee and beta-carbolines norharman and harman isolated from coffee”. Life Sciences78 (8): 795–802. doi:10.1016/j.lfs.2005.05.074. PMID16139309.
^Herraiz, T. (2004). “Relative exposure toβ-carbolines norharman and harman from foods and tobacco smoke”. Food Additives and Contaminants21 (11): 1041–50. doi:10.1080/02652030400019844. PMID15764332.
^ abHerraiz, Tomas; Chaparro, Carolina (2005). “Human monoamine oxidase is inhibited by tobacco smoke: β-carboline alkaloids act as potent and reversible inhibitors”. Biochemical and Biophysical Research Communications326 (2): 378. doi:10.1016/j.bbrc.2004.11.033. PMID15582589.
^Celikyurt, I. K.; Utkan, T; Gocmez, S. S.; Hudson, A; Aricioglu, F (2013). “Effect of harmane, an endogenous β-carboline, on learning and memory in rats”. Pharmacology Biochemistry and Behavior103 (3): 666–71. doi:10.1016/j.pbb.2012.10.011. PMID23107644.
^Rommelspacher, H; May, T; Salewski, B (1994). “Harman (1-methyl-beta-carboline) is a natural inhibitor of monoamine oxidase type a in rats”. European Journal of Pharmacology252 (1): 51–9. doi:10.1016/0014-2999(94)90574-6. PMID8149995.
^Adell, A; Biggs, T. A.; Myers, R. D. (1996). “Action of harman (1-methyl-beta-carboline) on the brain: Body temperature and in vivo efflux of 5-HT from hippocampus of the rat”. Neuropharmacology35 (8): 1101–7. doi:10.1016/s0028-3908(96)00043-3. PMID9121613.
^Rommelspacher, H; Nanz, C; Borbe, H. O.; Fehske, K. J.; Müller, W. E.; Wollert, U (1980). “1-Methyl-beta-carboline (harmane), a potent endogenous inhibitor of benzodiazepine receptor binding”. Naunyn-Schmiedeberg's archives of pharmacology314 (1): 97–100. doi:10.1007/bf00498436. PMID6255348.