Ball, C. N. (1996). A diachronic study of relative markers in spoken and written English. Language Variation and Change, 8(2), 227–258.

Birchfield, A. (2019). “All the people who live in Auckland”: A study of subject and non-subject relative clauses in Auckland English [Unpublished master’s thesis]. Victoria University of Wellington.

Cheshire, J. Variation in an English Dialect. Oxford University Press, 1982.

Comrie, B., & Kuteva, T. (2013). Relativization on subjects. WALS Online (v2020.3) [Data set]. In M. S. Dryer & M. Haspelmath (Eds.), The World Atlas of Language Structures Online, https://doi.org/10.5281/zenodo.7385533 (Available online at http://wals.info/chapter/122).

Fox, B. A., & Thompson, S. A. (1990). A discourse explanation of the grammar of relative clauses in English conversation. Language, 66(2), 297–316.

Gisborne, N. & Truswell, R. (2017). Where do relative specifiers come from? In E. Mathieu & R. Truswell (Eds.), Micro-change and macro-change in diachronic syntax (pp. 25–42). Oxford University Press.

Hinrichs, L., Szmrecsanyi, B., & Bohmann, A. (2015). Which-hunting and the Standard English relative clause. Language, 91(4), 806–836.

Huddleston, R., Pullum, G. K., & Peterson, P. Relative constructions and unbounded dependencies. In R. D. Huddleston & G. K. Pullum (Eds.), The Cambridge Grammar of the English Language (pp. 1031–1096). Cambridge University Press.

Johnson, D. E. (2009). Getting off the Goldvarb standard: Introducing Rbrul for mixed-effects variable rule analysis. Language and Linguistics Compass, 3(1), 359–383.

Le Page, R. B., & Tabouret-Keller, A. (1985). Acts of Identity: Creole-based approaches to language and ethnicity. Cambridge University Press.

Levey, S. A comparative variationist perspective on relative clauses in child and adult speech. (2014). In R. Torres Cacoulos, N. Dion, & A. Lapierre (Eds.), Linguistic variation: Confronting fact and theory (pp. 22–37). Routledge.

Meyerhoff, M., Birchfield, A., Ballard, E., Watson, C., & Charters, H. (2020). Restrictions on relatives in Auckland, New Zealand. In K. V. Beaman, I. Buchstaller, S. Fox, & J. A. Walker (Eds.), Advancing socio-grammatical variation and change: In honour of Jenny Cheshire (pp. 115–133). Routledge.

Meyerhoff, M., Ballard, E., Charters, H., Birchfield A., & Watson, C. I. (2021). The Auckland Voices Project: Language change in a changing city. In P. Peters & K. Burridge (Eds.), Exploring the ecology of world Englishes in the twenty-first century: Language, society and culture (pp. 345–368). Edinburgh University Press.

Parodi, T., & Tsimpli, I.-M. (2005). ‘Real’ and apparent optionality in second language grammars: Finiteness and pronouns in null operator structures. Second Language Research, 3, 250–285.

Romaine, S. (1984). Towards a typology of relative clause formation strategies in Germanic. In J. Fisiak (Ed.), Historical Syntax (pp. 437–470). Mouton de Gruyter.

Sakalauskaitė, J. (2016). Endogenous and Exogenous Influence on the which [Unpublished MSc in English Language thesis]. University of Edinburgh.

Sankoff, G. (2018). Language change across the lifespan. Annual Review of Linguistics, 4(1), 297–316.

Schneider, E. (2007). Postcolonial English: Varieties around the world. Cambridge University Press.

Sigley, R. J. (1997). Choosing Your Relatives: Relative Clauses in New Zealand English [Unpublished PhD thesis]. Victoria University of Wellington.

Sloetjes, H., & Wittenburg, P. (2008). Annotation by category – ELAN and ISO DCR. In Proceedings of the 6th International Conference on Language Resources and Evaluation (LREC 2008).

Tagliamonte, S. A., Smith J., & Lawrence, H. (2005). No taming the vernacular! Insights from the relatives in northern Britain. Language Variation and Change, 17(1), 74–112.

Trudgill, P. (2004). New-dialect Formation: The inevitability of colonial Englishes. Edinburgh University Press.

Trudgill, P., & Hannah, J. (2008). International English: A guide to the varieties of Standard English (5 ed.). Hodder Education.