Fraser HF, Wikler A, Essig CF, Isbell H (January 1958). "Degree of physical dependence induced by secobarbital or pentobarbital". Journal of the American Medical Association. 166 (2): 126–129. doi:10.1001/jama.1958.02990020014002. PMID13491317.
Fraser HF, Wikler A, Essig CF, Isbell H (January 1958). "Degree of physical dependence induced by secobarbital or pentobarbital". Journal of the American Medical Association. 166 (2): 126–129. doi:10.1001/jama.1958.02990020014002. PMID13491317.