M. Adamczyk, “Realisations of the word-initial variable (th) in selected late middle English northern legal documents”, in Variability in English across time and space, E. Waniek-Klimczak and A. Cichosz, Eds. Poland: Lodz University Press, 2016, pp. 11–41. doi: 10.18778/8088-065-8.02.