About GREEK-ENGLISH LEXICON

I don’t know what the words stand for, “Id”, “Il”, “Ib”.
Please tell me what they mean.

Il. will be Iliad, Id/id will be idem (i.e. the same author) and Ib (normally ib.) will be ibidem (i.e. in the same place (of a written work)).

~D

I haven’t learned Latin yet. Thank you.