Squiers, C. (1999). "Photographs, Drawings, and Collages by Frederick Sommer". Artforum.
Chicago-Zitierstil (17. Ausg.)Squiers, Carol. ""Photographs, Drawings, and Collages by Frederick Sommer"." Artforum 1999.
MLA-Zitierstil (8. Ausg.)Squiers, Carol. ""Photographs, Drawings, and Collages by Frederick Sommer"." Artforum, 1999.
警告：這些引文格式不一定是100％准確.