1. Recommended methods for the examination of urine;Meers,1979
2. A comparison of methods for collecting clean-catch urine specimens;Chavigny;Nurs Dig,1975
3. Midstream urine collection: Is preparatory cleansing essential?;Bray;NZ Nurs J,1979
4. Perineal cleansing before midstream urine, a necessary ritual?;Morris;Lancet,1979