Juola Patrick, Ramsay Stephen.Six Septembers: Mathematics for the Humanist. — Zea Books, 2017. — P. 116. — «By putting a picture inside a picture, you get a progression of suggessively smaller, but self-similar images (the box of Droste cocoa has a picture of a woman holding a box of Droste cocoa... ). In theory, this nesting could go on forever into infinite detail, but in practical terms, the resolution of the image limits how it's actually drawn.». — ISBN 978-1-60962-111-7.
