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Van Bever, W. F. M.; Niemegeers, C. J. E.; Janssen, P. A. J. (1974). „Synthetic analgesics. Synthesis and pharmacology of the diastereoisomers of N-[3-methyl-1-(2-phenylethyl)-4-piperidyl]-N-phenylpropanamide and N-[3-methyl-1-(1-methyl-2-phenylethyl)-4-piperidyl]-N-phenylpropanamide”. Journal of Medicinal Chemistry. 17 (10): 1047—1051. PMID4420811. doi:10.1021/jm00256a003.
Ayres, W. A.; Starsiak, M. J.; Sokolay, P. (1981). „The bogus drug: Three methyl & alpha methyl fentanyl sold as "China White"”. Journal of Psychoactive Drugs. 13 (1): 91—93. PMID7277090. doi:10.1080/02791072.1981.10471455.