Arnheim, R. The two sources of cognition: Rudolf Arnheim. Advances in visual semiotics : the Semiotic Web 1992 - 93.(1995).
Chicago-viite (17. p.)Arnheim, Rudolf. "The Two Sources of Cognition: Rudolf Arnheim." Advances in Visual Semiotics : The Semiotic Web 1992 - 93.(1995) .
MLA-viite (8. p.)Arnheim, Rudolf. "The Two Sources of Cognition: Rudolf Arnheim." Advances in Visual Semiotics : The Semiotic Web 1992 - 93.(1995), .
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