MLA
Teich, Curt, and Co. A Busy Day in the Cotton Field : Greetings from Palacios, Texas. 1941. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 68. https://digital.library.emory.edu/purl/385n8pk0s9-cor.
APA, 6th edition
Teich, C., & C. (1941). A busy day in the cotton field : greetings from Palacios, Texas (Box 68) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/385n8pk0s9-cor.
Chicago
Teich, Curt, and Co. “A Busy Day in the Cotton Field : Greetings from Palacios, Texas.” Postcards. Robert Langmuir African American Photograph Collection, 1941. Box 68. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/385n8pk0s9-cor.