#quartos

Hello there friend! I hope my reply to this is not too late to be of use to you; I’m afraid your ask got rather buried in my inbox. Editing and authorial attribution isn’t really my area, but I asked a friend of mine who works on this, and here are some recommendations: 

Pollard, Alfred W., Shakespeare Folios and Quartos: A Study in the Bibliography of Shakespeare’s Plays 1594-1685 (London: Methuen, 1909) (The term ‘bad quarto’ comes from this book).

Egan, Gabriel, The Struggle for Shakespeare’s Text: Twentieth-Century Editorial Theory and Practice (Cambridge: Cambridge University Press, 2010)

Maguire, Laurie, Shakespearean Suspect Texts (Cambridge: Cambridge University Press, 1996)

Marcus, Leah S., Unediting the Renaissance: Shakespeare, Marlowe, Milton (London: Routledge, 1996)

Irace, Kathleen O., Reforming the ‘Bad’ Quartos: Performance and Provenance of Six Shakespearean First Editions (Newark: University of Delaware Press, 1994)

Some books that focus specifically on Hamlet:

The Hamlet First Published (Q1, 1603): Origins, Form, Intertextualities, ed. by Thomas Clayton (Newark: University of Delaware Press, 1992) 

Urkowitz, Stephen, ‘“Well-sayd olde Mole”: Burying Three Hamlets in Modern Editions’, in Shakespeare Study Today, ed. by Georgianna Ziegler (New York: AMS Press, 1986), pp. 37-70 

Lesser, Zachary, Hamlet After Q1: An Uncanny History of the Shakespearean Text (Philadelphia: University of Pennsylvania Press, 2015)

Bourus, Terri, Young Shakespeare’s Young Hamlet: Print, Piracy and Performance (London: Palgrave Macmillan, 2014)

In terms of arguments about Shakespeare as a collaborator, I would have a look at the authorship studies stuff. A good place to start would be the Authorship Companion to the recent New Oxford Shakespeare, which collates most work in the area, so it will contain pretty much every reference you might need in that field. The editors who worked on that are pretty strong believers in the concept of the collaborative dynamic of writing plays, so it will definitely fit with the approach you’re hoping to take.

I hope this helps!