Sullivan, C. (2014). Drawing the landscape: The art of hand drawing and digital representation (Fourth Edition.). John Wiley & Sons, Inc.
Lua i Stíl Chicago (17ú heag.)Sullivan, Chip. Drawing the Landscape: The Art of Hand Drawing and Digital Representation. Fourth Edition. Hoboken, New Jersey: John Wiley & Sons, Inc, 2014.
Lua MLA (9ú heag.)Sullivan, Chip. Drawing the Landscape: The Art of Hand Drawing and Digital Representation. Fourth Edition. John Wiley & Sons, Inc, 2014.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.