- Jastrow is the historical standard for Aramaic, the equivalent of BDB for Hebrew. If you're doing any Aramaic, it should be in your library, period.
- Really an excellent and broad introduction. It presumes a very basic knowledge of Hebrew, but then covers historical grammar differences, and background. Beyond Biblical Aramaic (really a very small portion of the extent Aramaic corpus), it introduces Imperial, epigraphic, and Targumic Aramaic as well.
- AYBD is THE scholarly Bible Dictionary. Lengthy bibliographies, detailed articles on many subjects, and an academic approach (i.e. not put out by a creedal or religiously affiliated publisher) make it an indispensable research tool. AYBD (at the time ABD) was my first purchase in Logos.