Carbon dioxide (Simple English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Carbon dioxide" in Simple English language version.

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archive.org (Global: 6^th place; Simple English: 4^th place)

Fullick, Ann (2011). Edexcel IGCSE Biology Revision Guide. Pearson Education. p. 40. ISBN 9780435046767.
Woolley, Steve (2011). Edexcel IGCSE Physics Revision Guide. Pearson Education. p. 59. ISBN 9780435046736.

doi.org (Global: 2^nd place; Simple English: 3^rd place)

Pierantozzi, Ronald (2001). "Carbon Dioxide". Kirk-Othmer Encyclopedia of Chemical Technology. John Wiley & Sons, Inc. doi:10.1002/0471238961.0301180216090518.a01.pub2. ISBN 0471238961.