^ Linguistic Variation in the Shakespeare Corpus: Morpho-Syntactic Variability of Second Person Pronouns ISBN 9781588112804 (revised Apr 2026)
^Ulrich BusseLinguistic Variation in the Shakespeare Corpus : Morpho-Syntactic Variability of Second Person Pronouns 106 by Ulrich Busse (2002, Hardcover)ISBN 9781588112804 (revised Mar 2015)