KRASNEGOR NORMAN A. 552,601 SELF-ADMINISTRATION Self-administration of abused substances : methods for study / ed. Norman A. Krasnegor. - Rockville, Maryland : National Institute on Drug Abuse, Division of Research ; Department of Health, Education and Welfare, Public Health Service [...], July 1978. - IX, 246 s. : wykr. ; 23 cm (NIDA Research Monograph ; 20)