Nicholson, S. (2006). E-encyclopedia. Dorling Kindersley.
Lua i Stíl Chicago (17ú heag.)Nicholson, Sue. E-encyclopedia. New Delhi: Dorling Kindersley, 2006.
Lua MLA (9ú heag.)Nicholson, Sue. E-encyclopedia. Dorling Kindersley, 2006.
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