Betti, C. (1986). Drawing: A contemporary approach (2nd ed.). Holt, Rinehart and Winston.
Cita Chicago (17th ed.)Betti, Claudia. Drawing: A Contemporary Approach. 2nd ed. New York: Holt, Rinehart and Winston, 1986.
Cita MLA (9th ed.)Betti, Claudia. Drawing: A Contemporary Approach. 2nd ed. Holt, Rinehart and Winston, 1986.
Atenció: Aquestes cites poden no estar 100% correctes.