His grandmothers :
a summer salad.

APA Citation

Campbell, H., G.P. Putnam's Sons. (1877). His grandmothers: a summer salad. New York: G.P. Putnam.

MLA Citation

Campbell, Helen, 1839-1918, and G.P. Putnam's Sons. His Grandmothers: a Summer Salad. New York: G.P. Putnam, 1877.

Warning: These citations may not always be complete (especially for serials).