Lichtenstein, R. (1981). Study for "Yellow Apple" and "Yellow Apple", By Roy Lichtenstein. Artforum.
Chicago-referens (17:e uppl.)Lichtenstein, Roy. "Study for "Yellow Apple" and "Yellow Apple", By Roy Lichtenstein." Artforum 1981.
MLA-referens (8:e uppl.)Lichtenstein, Roy. "Study for "Yellow Apple" and "Yellow Apple", By Roy Lichtenstein." Artforum, 1981.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.