Robles, G. (2013). Sketchbook Pro digital painting essentials. Packt Publishing.
芝加哥风格引文Robles, Gil. Sketchbook Pro Digital Painting Essentials. Birmingham: Packt Publishing, 2013.
MLA引文Robles, Gil. Sketchbook Pro Digital Painting Essentials. Packt Publishing, 2013.
警告：这些引文格式不一定是100％准确.