Shields, K. (2017) „Linguistic typology and the Indo-European sigmatic future . 603”, w Németh, M. i in. (red.) Essays in the History of Languages and Linguistics: Dedicated to Marek Stachowski on the Occasion of His 60th Birthday. Poland: Wydawnictwo Księgarnia Akademicka. doi:10.12797/9788376388618.36.