Citazione Stile APA (7a Edizione)

Collier, G. (1967). Form, space, and vision through drawing (4th ed.). Prentice-Hall.

Citazione stile Chigago Style (17a edizione)

Collier, Graham. Form, Space, and Vision Through Drawing. 4th ed. Englewood Cliffs, N.J: Prentice-Hall, 1967.

Citatione MLA (9a ed.)

Collier, Graham. Form, Space, and Vision Through Drawing. 4th ed. Prentice-Hall, 1967.