A great deal has been written about David Garrick and the 18th-century theatre. See the following guides:
Berkowitz, Gerald M., David Garrick: a reference guide Boston, Mass., 1980 [A bibliography of writings by and about David Garrick].
Folger Library, Annotated Bibliography … David Garrick.
Biography
Kendall, A., David Garrick: a biography, London, 1985.
Little, D.M. & Kahrl, G.M., The Letters of David Garrick, 3 vols, London, 1963.
McIntyre, Garrick, London, 1999.
Oman, C., David Garrick, London, 1958.
Parsons, Mrs Clement, Garrick and his Circle (London, 1906) (electronic version).
Garrick and Shakespeare
Cunningham, Vanessa, Shakespeare and Garrick Cambridge, Cambridge University Press 2011.
Fox, Levi. A Splendid Occasion: the Stratford Jubilee of 1769, Occasional papers; no. 20. Stratford-upon-Avon: Dugdale Society, 1973.
Oya, Reiko, Representing Shakespearean Tragedy. Garrick, the Kembles and Kean Cambridge, Cambridge University Press, 2011.
Stockholm, J.M., Garrick’s Folly: Shakespeare’s Jubilee London, 1964.
Stone, George Winchester, ‘Garrick’s Long Lost Alteration of Hamlet’, Proceedings of the Modern Language Association 49.3 (1934): 890-921.
Garrick and the Theatre
Benedetti, J. David Garrick and the birth of modern theatre (London, 2001).
Burnim, Kalman A. David Garrick, Director (Pittsburgh: University of Pittsburg Press, 1961).
Stein, Elizabeth P. David Garrick, Dramatist New York: MLA, 1938.
Nicoll, Allardyce. The Garrick Stage: Theatres and Audience in the Eighteenth Century, Edited by Sybil Marion Rosenfeld. Manchester, Manchester University Press, 1980.
Garrick’s Writing
The Diary of David Garrick, Being a Record of His Memorable Trip to Paris in 1751. Edited by Ryllis Clair Alexander Goslin. New York: Oxford University Press, 1928.
The Journal of David Garrick, Describing His Visit to France and Italy in 1763. Edited by George Winchester Stone. New York: The Modern Language Association of America, 1939.
Printed from the original 1763 manuscript in the Folger Shakespeare Library.
The Letters of David Garrick. Edited by David Mason Little and George Morrow Kahrl. 3 vols. Cambridge, Mass.: Belknap Press of Harvard University Press, 1963.
The Poetical Works of David Garrick (London, 1785) 2vols; facsimile edn Blom, Benjamin, ed., New York and London, 1968.
Ragandjaw (private perf. 1746). First printed in Harry William Pedicord, ‘Ragandjaw: Garrick’s Shakespearian Parody for a Private Theatre’ Philological Quarterly 60 (1981), 197-204.