Grewal RP, Martinez M, Hoehe M, Bonner TI, Gershon ES, Detera-Wadleigh S (1992). „Genetic linkage mapping of the m4 human muscarinic receptor (CHRM4)”. Genomics. 13 (1): 239—40. PMID1577490. doi:10.1016/0888-7543(92)90236-L.
Teaktong T, Piggott MA, Mckeith IG, Perry RH, Ballard CG, Perry EK (2005). „Muscarinic M2 and M4 receptors in anterior cingulate cortex: relation to neuropsychiatric symptoms in dementia with Lewy bodies”. Behavioural Brain Research. 161 (2): 299—305. PMID15922057. doi:10.1016/j.bbr.2005.02.019.
Grewal RP, Martinez M, Hoehe M, Bonner TI, Gershon ES, Detera-Wadleigh S (1992). „Genetic linkage mapping of the m4 human muscarinic receptor (CHRM4)”. Genomics. 13 (1): 239—40. PMID1577490. doi:10.1016/0888-7543(92)90236-L.
Teaktong T, Piggott MA, Mckeith IG, Perry RH, Ballard CG, Perry EK (2005). „Muscarinic M2 and M4 receptors in anterior cingulate cortex: relation to neuropsychiatric symptoms in dementia with Lewy bodies”. Behavioural Brain Research. 161 (2): 299—305. PMID15922057. doi:10.1016/j.bbr.2005.02.019.
Lazareno S, Buckley NJ, Roberts FF (1990). „Characterization of muscarinic M4 binding sites in rabbit lung, chicken heart, and NG108-15 cells”. Molecular Pharmacology. 38 (6): 805—15. PMID2250662.