Cita APA (7a ed.)

Helfenstein, J., & Eckhardt, S. (2008). Form, color, illumination: Suzan Frecon painting / Josef Helfenstein and Matthias Frehner with Sarah Eckhardt. Yale Univ. Press [u.a.].

Cita Chicago Style (17a ed.)

Helfenstein, Josef, y Sarah Eckhardt. Form, Color, Illumination: Suzan Frecon Painting / Josef Helfenstein and Matthias Frehner with Sarah Eckhardt. New Haven: Yale Univ. Press [u.a.], 2008.

Cita MLA (8a ed.)

Helfenstein, Josef, y Sarah Eckhardt. Form, Color, Illumination: Suzan Frecon Painting / Josef Helfenstein and Matthias Frehner with Sarah Eckhardt. Yale Univ. Press [u.a.], 2008.