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- Physician and nurse migration : analysis and policy implications / by Alfonso Mejía, Helena Pizurki, Erica Royston - Geneva : World Health Organization , 1979 - xiv, 476 s. ISBN 92-4-156059-2 [1, currently available 1]
- Chapters, articles
- Preventing maternal deaths / edit. Erica Royston, Gue Armstrong - Geneva : WHO , 1989 - 233 s. ISBN 92-4-156128-9 [1, currently available 1]
- Chapters, articles