Cita APA (7th ed.)

Martin i Roig, G., & Bru, M. (2005). Line and shading in drawing. Barron's Educational Series.

Cita Chicago (17th ed.)

Martin i Roig, Gabriel, i Marta Bru. Line and Shading in Drawing. Hauppauge, NY: Barron's Educational Series, 2005.

Cita MLA (9th ed.)

Martin i Roig, Gabriel, i Marta Bru. Line and Shading in Drawing. Barron's Educational Series, 2005.