R. Declerck, Studies on copular sentences, clefts and pseudo-clefts, 1988.

M. Dikken, Specificational copular sentences and pseudoclefts. The Blackwell companion to syntax, pp.292-409, 2005.

H. Drubig and W. Schaffer, Language typology and language universals, pp.1079-1104, 2001.

. Drubig and . Hans-bernhard, Toward a typology of focus and focus constructions Linguistics, vol.41, pp.1-50, 2003.

, Cleft structures, 2013.

K. Lambrecht, A Framework for the Analysis of Cleft Constructions, Information Structure and Sentence Form. Topic, Focus, and the Mental Representations of Discourse Referents. Cambridge Studies in Linguistics 71, vol.39, pp.463-516, 1994.

L. Mikkelsen, Copular Clauses: Specification, predication and equation, 2005.

A. L. Patten, The English it-cleft: A constructional account and a diachronic investigation, 2012.

P. Schachter, Focus and relativization. Language, vol.49, pp.20-46, 1973.