Design Seeds (2015) Color Set
Available at: https://www.design-seeds.com/in-nature/nature-made/color-set8/
(Accessed: 19/1/2021).
Design Seeds (2020) Natural Tones
Available at: https://www.design-seeds.com/in-nature/nature-made/nature-tones-40/
(Accessed: 20/1/2021).