(can also use DE5 .O9 1999)
Excellent resource for many aspects of the ancient world. The dictionary includes a good list of standard abbreviations for ancient authors and texts. It does not have every obscure mythological figure, but each entry has basic entry level bibliography on the topic.
 Daughter of Lapith → Hypseus, third wife of → Athamas (Herodoros 3I F 38 FGrh; Apollod. I, 84; Ath. 13,560d; Nonn. Dion. 9,305-307; Tzetz. Lykophr. 22), who is the father of her several children. Her predecessors were → Nephele [I] and Ino. When the latter returns, T., tries to kill her children (Hyg. Fab. 4,239, otherwise in Fab. I). By means of change of clothing Ino causes T. to kill her own children, whereupon T. takes her own life.  Daughter of → Inachus [I], by → Zeus the mother of → Arcas and ancestor of the Arcadians (Istros 334 F 75 FGrH).
Th. Ganshow, s. v. Leukonoe, LIMC 6.I, 272;
A. Lesky, s. v. T. (I-2), RE 5 A, 1680-1683. R. HA.
Themisto, name of several heroines, the only one of importance being the daughter of Hypseus (Nonnus, Dion. 9. 305 f.), wife of *Anthamas. Herodorus, in schol. Ap. Rhod. 2. 1144, makes her his first wife and mother of several childrens including Phrixus and Helle.
See Hofer in Röscher; Themisto'. HJR
chronological order cross-reference Fragment - Don't use! primary source citation author of reference entry
Remember that each reference book has a list of abbreviations at the front of the book to help you decode the entry.
In Brill's New Paulythis begins on page XI and includes a list of general abbreviations, bibliographic abbreviations, ancient authors/works, and a list of contributing authors to the encyclopaedia. NOTE: There is no list of bibliographic abbreviations or ancient authors in volumes 2, 4, 5, & 6 - you will need to look at the beginning of another volume to find that information!
Additional tip for Brill's: the Index (shelved after the last volume) has a completely alphabetized "List of Authors" (=contributing authors to the encyclopaedia) starting on pg. 287.
In the Oxford Classical Dictionary abbreviations lists begin on page XVII with an index to the initials of the contributors, and continues with a list of abbreviations that includes the ancient authors/works.