Lua APA (7ú heag.)

Berry, C. (2011). The sustainable procurement guide: Procuring sustainably using BS 8903. BSi.

Lua i Stíl Chicago (17ú heag.)

Berry, Cathy. The Sustainable Procurement Guide: Procuring Sustainably Using BS 8903. London: BSi, 2011.

Lua MLA (8ú heag.)

Berry, Cathy. The Sustainable Procurement Guide: Procuring Sustainably Using BS 8903. BSi, 2011.

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