APA Format
World Health Organization (WHO) . (). Barium and barium compounds: concise international chemical assessment document, Int.prog.on chemical safety. : Geneva WHO 2001
MLA Format
World Health Organization (WHO) . Barium and barium compounds: concise international chemical assessment document, Int.prog.on chemical safety. : Geneva WHO 2001,
Australian/Harvard Format
World Health Organization (WHO) . . Barium and barium compounds: concise international chemical assessment document, Int.prog.on chemical safety. Geneva WHO 2001, 
Warning: These citations may not always be 100% accurate.