A Pic-Nic Party, Brooklyn Museum; Hern, Mary Ellen W. (Summer–Autumn 1989). «Picnicking in the Northeastern United States, 1840-1900». Winterthur Portfolio 24.2/3: 139–152 (Fig. 1).
Hern 1989, s. 141. Hern, Mary Ellen W. (1989), «Picnicking in the Northeastern United States, 1840-1900», Winterthur Portfolio (The University of Chicago Press on behalf of the Henry Francis du Pont Winterthur Museum, Inc.), 24, No. 2/3 (Summer - Autumn): 139–152, henta 23-09-2016
Hern 1989, s. 144-5. Hern, Mary Ellen W. (1989), «Picnicking in the Northeastern United States, 1840-1900», Winterthur Portfolio (The University of Chicago Press on behalf of the Henry Francis du Pont Winterthur Museum, Inc.), 24, No. 2/3 (Summer - Autumn): 139–152, henta 23-09-2016
Hern 1989, s. 146. Hern, Mary Ellen W. (1989), «Picnicking in the Northeastern United States, 1840-1900», Winterthur Portfolio (The University of Chicago Press on behalf of the Henry Francis du Pont Winterthur Museum, Inc.), 24, No. 2/3 (Summer - Autumn): 139–152, henta 23-09-2016
Hern 1989, s. 142. Hern, Mary Ellen W. (1989), «Picnicking in the Northeastern United States, 1840-1900», Winterthur Portfolio (The University of Chicago Press on behalf of the Henry Francis du Pont Winterthur Museum, Inc.), 24, No. 2/3 (Summer - Autumn): 139–152, henta 23-09-2016
