Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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