Petersen, Jan Heegård. «Contact-Induced Change or Dialectal Relic in Heritage American-Danish? The Indefi-Nite Article in Copula Clauses With a Person-Identifying Subject Predicate». Norsk Lingvistisk Tidsskrift, bd. 36, nr. 1, april 2018, https://ojs.novus.no/index.php/NLT/article/view/1489.