Gruber, L. F. (1992). Duane Michals: Photography and reality ; [retrospective] 1958 - 1990 ; [ accompanies the exhibition "Duane Michals: photography and reality" travelling through Europe in the 1990's] / [texts: L. Fritz Gruber ]. Olympus European Photo Gallery.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGruber, L. Fritz. Duane Michals: Photography and Reality ; [retrospective] 1958 - 1990 ; [ Accompanies the Exhibition "Duane Michals: Photography and Reality" Travelling Through Europe in the 1990's] / [texts: L. Fritz Gruber ]. Winterswijk: Olympus European Photo Gallery, 1992.
एमएलए (8वां संस्करण) प्रशस्ति पत्रGruber, L. Fritz. Duane Michals: Photography and Reality ; [retrospective] 1958 - 1990 ; [ Accompanies the Exhibition "Duane Michals: Photography and Reality" Travelling Through Europe in the 1990's] / [texts: L. Fritz Gruber ]. Olympus European Photo Gallery, 1992.