Gaya APA

Boerboom, P., Protel, T. (2017). Drawing Perspective Methods for Artists : 85 Methods for Creating Spatial Illusion in Art . China: Rockport.

Gaya MLA

Boerboom, Peter., Protel, Tim. "Drawing Perspective Methods for Artists : 85 Methods for Creating Spatial Illusion in Art". China: Rockport, 2017. Text.