Sources: 

• Bunnell, Lynda & Ra Uru Hu. The Definitive Book of Human Design: The Science of Differentiation. HDC Publishing, 2017.
• Curry, Karen. Understanding Human Design. Hierophant Publishing, 2013.
• Parker, Karen Curry, et.al. Abundance by Design. GracePoint Matrix, 2016.
• Parker, Karen Curry. Human Design Activation Guide. GracePoint Matrix, 2018.
• Parkyn, Chetan. Human Design: Discover the Person You Were Born to Be. New World Library, 2009.