1. Social Security. Screening for early detection of phenylketonuria. HM(69)72;Department of Health and,1969
2. Letter: Blood screening for phenylketonuria;Guthrie, R.;JAMA
3. Social Security. Present day practice in infant feeding. Reports on Health and Social Subjects No 9;Department of Health and,1974
4. Lemag Working Party. Estimation of blood phenylalanine from a dried blood spot using the Guthrie test;J Clin Pathol,1971
5. A simple phenylalanine method for detecting phenylketonuria in large populations of newborn infants;Guthrie, R.; Susi, A.;Pediatrics,1963