APA (7e ed.) Bronvermelding

Hillberry, J. D. (1999). Drawing realistic textures in pencil (First edition.). North Light Books.

Chicago (17e ed.) Bronvermelding

Hillberry, J. D. Drawing Realistic Textures in Pencil. First edition. Cincinnati, Ohio: North Light Books, 1999.

MLA (9e ed.) Bronvermelding

Hillberry, J. D. Drawing Realistic Textures in Pencil. First edition. North Light Books, 1999.