Digital image: Dick Mudde - Sneeuw-Weegje
Digital image: N.p., n.d. Web. 18 Jan. 2016.
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Digital image. Http://www.dailyrecord.co.uk/lifestyle/10-christmas-tips-your-home-4754501. N.p., n.d. Web. 18 Jan. 2016.
Digital image: Green Chemistry http://eng-cs.syr.edu/green-chemistry/
Digital image: http://www.athina984.gr/2015/12/17/i-deka-koryfei-epistimones-ke-i-deka-simantikoteres-anakalypsis-gia-to-2015/
