Livy.
Books I, XXI, and XXII.
With introduction and notes by John Howell Westcott.

APA Citation

Livy. (1892). Livy. Boston: Allyn and Bacon.

MLA Citation

Livy. Livy. Boston: Allyn and Bacon, 1892.

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