King, L., & Sedefov, R. (2007). Early-warning system on new psychoactive substances: Operating guidelines ([1st ed.].). Office for Official Publications of the European Communities.
Citácia podle Chicago (17th ed.)King, Leslie, a Roumen Sedefov. Early-warning System on New Psychoactive Substances: Operating Guidelines. [1st ed.]. Luxembourg: Office for Official Publications of the European Communities, 2007.
Citácia podľa MLA (8th ed.)King, Leslie, a Roumen Sedefov. Early-warning System on New Psychoactive Substances: Operating Guidelines. [1st ed.]. Office for Official Publications of the European Communities, 2007.
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