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:[https://www.amazon.co.uk/gp/product/178294558X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=178294558X&linkCode=as2&tag=nrjc-21&linkId=f0dfb66dafcb0c6e9449e7b1a4ae1ac356 ''Period, page 73, GCSE Physics; The Revision Guide, CGP, AQA '']
====Edexcel====
:[https://www.amazon.co.uk/gp/product/17829455981292120223/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=17829455981292120223&linkCode=as2&tag=nrjc-21&linkId=ad276ad49df77ab4b40ab4fd0fe10152 068ecf40278c32406a7f1c6e66751417 ''Periods Period (of the periodic tablea wave), page 10749, GCSE Combined SciencePhysics, Pearson Edexcel '']:[https://www.amazon.co.uk/gp/product/1782945733/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945733&linkCode=as2&tag=nrjc-21&linkId=2a2dbec9db6bf5766c0458d908fa0a52 ''Period (wave), page 32, GCSE Physics; The Revision Guide, CGP, AQA Edexcel '']:[https://www.amazon.co.uk/gp/product/17829455711782948163/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=17829455711782948163&linkCode=as2&tag=nrjc-21&linkId=9e29fad914244909903e5e93f8a01d205 0fdbfd5dd397d6e24a9dfb250f08587f ''Periods Period (of the periodic tablewaves), page 2291, GCSE Chemistry; The Revision GuidePhysics, CGP, AQA Edexcel '']