World Health Organization; KOHNER, E. M; PORTA, M. 1992. Screening for diabetic retinopathy in Europe: <a> field guide-book. Copenhagen: WHO Regional Office for Europe.
APA (7th ed.) CitationWorld Health Organization, Kohner, E. M., & Porta, M. (1992). Screening for diabetic retinopathy in Europe: <a> field guide-book. WHO Regional Office for Europe.
Chicago Style (17th ed.) CitationWorld Health Organization, Eva M. Kohner, and M. Porta. Screening for Diabetic Retinopathy in Europe: <a> Field Guide-book. Copenhagen: WHO Regional Office for Europe, 1992.
MLA (9th ed.) CitationWorld Health Organization, et al. Screening for Diabetic Retinopathy in Europe: <a> Field Guide-book. WHO Regional Office for Europe, 1992.
