If you use a dictionary to help you translate a source, you do not need to cite the dictionary. Simply indicate that the translation is your own by writing “my trans.” in parentheses. For instance:

In Theodor Storm’s Viola tricolor, the young daughter of the household, Nesi, refers to the family’s garden as “Grossmutters Garten” (“grandmother’s garden”; 678; my trans.), thereby underscoring the garden’s historical dimension as a space of matrilineal inheritance.

Work Cited

Storm, Theodor. “Viola tricolor.” Sämtliche Werke in zwei Bänden, by Storm, vol. 1, Winkler, 1967, pp. 675–705.