Tham khảo Phụ ngữ

  1. ↑ Huddleston, Rodney; Pullum, Geoffrey K. (2002). The Cambridge Grammar of the English Language. Cambridge University Press. ISBN 0-521-43146-8.
  2. ↑ Rijkhoff, Jan (2014). “Modification as a propositional act in Functional Discourse Grammar”. Trong de los Ángeles Gómez González, María; de Mendoza Ibáñez, Francisco José Ruiz; Gonzálvez-García, Francisco (biên tập). Studies in Functional and Structural Linguistics. Amsterdam: John Benjamins Publishing Company. tr. 129–150. doi:10.1075/sfsl.68.06rij. ISSN 1385-7916.