Bài viết được hoàn thiện với sự trợ giúp từ các nguồn:
Chilton, G. (n.d.). How to Clean Room by Room - dummies. [online] dummies. Available at: https://www.dummies.com/home-garden/home-improvement/cleaning-stain-removal/how-to-clean-room-by-room/ [Accessed 10 Jan. 2019].
Chilton, G. (2004). How to Decide on Cleaning Frequency - dummies. [online] dummies. Available at: https://www.dummies.com/home-garden/home-improvement/cleaning-stain-removal/how-to-decide-on-cleaning-frequency/ [Accessed 10 Jan. 2019].
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