; Denham, T.; Dobney, K.; Doust, A. N.; Gepts, P.; Gilbert, M. T. P.; Gremillion, K. J.; Lucas, L.; Lukens, L.; Marshall, F. B.; Olsen, K. M.; Pires, J
(原始内容存档于24 January 2021). Understanding Political Color Designations. Gremillion Consulting. [24 January 2021]. (原始内容存档于31 January 2021). Enninful, Ebenezer