Howells, G. (1998). Consumer Product Safety Geraint Howells. Ashgate.
Lua i Stíl Chicago (17ú heag.)Howells, Geraint. Consumer Product Safety Geraint Howells. Ashgate, 1998.
Lua MLA (8ú heag.)Howells, Geraint. Consumer Product Safety Geraint Howells. Ashgate, 1998.
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