APA
World Health Organization W., . (1991). Biological subtances : international standars and reference reagents 1990. Geneva: World Health Organization.
Chicago
World Health Organization Who, . 1991. Biological subtances : international standars and reference reagents 1990. Geneva: World Health Organization.
Harvard
World Health Organization W., . (1991). Biological subtances : international standars and reference reagents 1990. Geneva: World Health Organization.
MLA
World Health Organization Who, . Biological subtances : international standars and reference reagents 1990. Geneva: World Health Organization. 1991.