1. Goodman and Gilman's The Pharmacological Basis of Therapeutics;Gilman,1990
2. NTP Technical on the toxicology and carcinogenesis studies of codeine in F344/N rats and B6C3F1 mice;National Toxicology Program;TR 455 NIH Publication No. 95-3360,1995
3. NTP Technical Report on the toxicology and carcinogenesis of methylphenidate hydrochloride;National Toxicology Program;TR 439. NIH Publication No. 95-3355,1995
4. Decreases in spontaneous tumors in rats and mice after treatment with amphetamine;Dunnick;Toxicology,1991