A standard list of abbreviations is available on the landing page of the electronic edition of the Oxford Classical Dictionary (OCD).
(Herodotus, 1.32.7)
(Sophocles, Oedipus Tyrannus 447-462)
(Virgil, Aeneid 2.49)
(Plato, Republic 360e–361b)
(Hdt. 1.32.7)
(Soph. OT 447-462)
(Verg. Aen. 2.49)
(Pl. Resp. 360e-361b)
*For reference see the Notes and Bibliography section (14.142 - 14.152) of the Chicago Manual of Style 18th ed.
**The formatting of classical works (books, sections, lines, etc.) is standardized across all editions regardless if the text is in the original language or translation. See Chicago 14.143.