Below you will find guidance and examples of how to set out a reference for a translated work in the body of your work and in the reference list at the end.
Laplace (1814/1951) notes that...
Last name, Initial(s)., & Last name, Initial(s). (Year). Title (Initial(s), Last name, Trans.; ed.). Publisher. (Original work published yyyy).
Laplace, P. S. (1951). A philosophical essay on probabilities. (F. W. Truscott & F. F. L. Emory, Trans.). Dover. (Original work published 1814).
Note: When you cite a republished work, like the one above, in your text it should appear with both dates: Laplace (1814/1951).