Oxford Dictionary

    O Hehir, Brendan; Dillon, John M. A classical lexicon for Finnegans wake 

    Mink, Louis O. A Finnegans wake gazetteer 

    O Hehir, Brendan A Gaelic lexicon for Finnegans wake, and glossary for Joyce's other works 

    Bonheim, Helmut A lexicon of the German in Finnegans wake 

    Glasheen, Adaline, Third census of Finnegans wake

    Deane, Vincent & Ferrer, Daniel & Lernout, Geert, The Finnegans Wake Notebooks at Buffalo

    McHugh, Roland, The Sigla of Finnegans Wake, Annotations to Finnegans Wake

    David Hayman, A first-draft version of Finnegans Wake

    Campbell, Joseph & Robinson, Henry Morton A Skeleton Key to Finnegans Wake

    Rose, Danis, Chapters of Coming Forth by Day

    Troy, Mark L. Mummeries of Resurrection: The Cycle of Osiris in Finnegans Wake

    Crispi, Luca & Slote, Sam, How Joyce Wrote Finnegans Wake: A Chapter-by-Chapter Genetic Guide

    Gordon, John, Notes on Issy

    David Hayman, Sam Slote, Genetic studies in Joyce

    Gordon, John, Finnegans Wake, a plot summary

    Much more elucidations could be found at: