APA (7 वां संस्करण) प्रशस्ति पत्र

Gunnar A. Hardarson. (2011). Thought at work: Painting, Photography, Philosophy. Perspectives : at the convergence of art and philosophy.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Gunnar A. Hardarson. "Thought at Work: Painting, Photography, Philosophy." Perspectives : At the Convergence of Art and Philosophy 2011.

एमएलए (8वां संस्करण) प्रशस्ति पत्र

Gunnar A. Hardarson. "Thought at Work: Painting, Photography, Philosophy." Perspectives : At the Convergence of Art and Philosophy, 2011.