APA
World Health Organization, . (1991). Biological substances : international standards and reference reagents 1990. W.H.O., Geneva: .
Chicago
World Health Organization, . 1991. Biological substances : international standards and reference reagents 1990. W.H.O., Geneva: .
Harvard
World Health Organization, . (1991). Biological substances : international standards and reference reagents 1990. W.H.O., Geneva: .
MLA
World Health Organization, . Biological substances : international standards and reference reagents 1990. W.H.O., Geneva: . 1991.