Perhaps I should have been more specific, sorry I see now how I made it seem I was completely ignorant of her... I have seen all of the online sources on her and have read here and there little exercpts from other books which mention her, but I am searching for articles or sources that are devoted to her as a topic/subject. Since no books exist, (that I know of), I would hope journal articles do.
I ask because I would like to write an essay on her and my professors will not accept online sources as references... as it stands now I fear I will not be able to find enough material to write a 15 page paper, but who knows... I might.
Thanks for any help...
From the sources indicated at roman-emperors.org, it doesn't look like you could get more than a few pages.
Editions:
Primary: For Placidia's extant correspondence, see Otto Guenther ed., Epistulae imperatorum pontificum aliorum inde ab a. CCCLXVII usque ad a. DLIII datae avellana quae dicitur collectio, C.S.E.L. vol 35 pt.1 (Vienna, 1895) nos.25,27-28 (pp.71-74).
Critical Studies:
Gerke, F., "L'Iconografia delle monete imperiale dall' Augusta Galla Placidia." Corsi di cultura sull'arte ravennate e bizantina 13(1966): 163-204
Nagl, Maria Assunta, Galla Placidia , Studien zur Geschichte und Kultur des Altertums. New York, 1967.
Oost, Stewart I. "Galla Placidia and the Law." Classical Philology 63(1968): 114-121.
________. "Some Problems in the History of Galla Placidia." Classical Philology 60(1965): 1-10.
________. Galla Placidia Augusta. A Biographical Essay. Chicago, 1968.
Sirago, V.A. Galla Placidia e la trasformazione politica dell' Occidente. Louvain, 1961.