APA
Powell W. F., . (1989). Color thick and thin. Tustin: Walfer Foster.
Chicago
Powell William F, . 1989. Color thick and thin. Tustin: Walfer Foster.
Harvard
Powell W. F., . (1989). Color thick and thin. Tustin: Walfer Foster.
MLA
Powell William F, . Color thick and thin. Tustin: Walfer Foster. 1989.