United Nations Environment Programme, et al. 1990. Barium. Geneva: WHO.
Citace podle APA (7th ed.)United Nations Environment Programme, International Labour Organisation, World Health Organization, & International Programme on Chemical Safety. (1990). Barium. WHO.
Citace podle Chicago (17th ed.)United Nations Environment Programme, International Labour Organisation, World Health Organization, a International Programme on Chemical Safety. Barium. Geneva: WHO, 1990.
Citace podle MLA (9th ed.)United Nations Environment Programme, et al. Barium. WHO, 1990.
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