APA
Royston E. (. &. A. S. (., . (1989). Preventing maternal deaths. Geneva: World Health Organization.
Chicago
Royston Erica (ed) & Armstrong Sue (ed), . 1989. Preventing maternal deaths. Geneva: World Health Organization.
Harvard
Royston E. (. &. A. S. (., . (1989). Preventing maternal deaths. Geneva: World Health Organization.
MLA
Royston Erica (ed) & Armstrong Sue (ed), . Preventing maternal deaths. Geneva: World Health Organization. 1989.