Van der Auwera, Johan; Gast, Volker; Vanderbiesen, Jeroen (2012). "Human impersonal pronoun uses in English, Dutch and German". Leuvense Bijdragen. 98: 27–64. doi:10.2143/LB.98.0.2990718.
Allen, Cynthia L. (December 1986). "Dummy subjects and the verb‐second 'target' in old English". English Studies. 67 (6): 465–470. doi:10.1080/00138388608598474.
Bennis, Hans (2005). "Chapter 2. HET as a Referential Expression". Gap and Dummies. Amsterdam Academic Archive. Amsterdam: Amsterdam University Press. pp. 93–170. ISBN978-90-485-0415-2. JSTORj.ctt46mtsw.6. Retrieved 2022-10-20.