sumber bacaan

terkilir:
http://eniharyanti.com/pertolongan-pertama/apabila-tangan-atau-kaki-terkilir/
 http://sutanrajodilangik.wordpress.com/2007/11/23/pertolongan-pertama-pada-kecelakaan/
http://id.answers.yahoo.com/question/index?qid=20100530195842AAMQrjL

konsentrasi co2
http://campaign.pelangi.or.id/?show=pages&detail=1&cid=4
http://safru.blogspot.com/2011/03/ruangan-ber-ac-bisa-memicu-mata-kering.html
http://www.batan.go.id/ptrkn/file/Epsilon/vol_13_03/p5.pdf