A. , D. Quer, and J. , The syntax and semantics of unselected embedded questions, Language, 77, pp.107-133, 2001.

C. , J. Pdf, D. , M. &. Irurtzun, and A. , Xiberotarraren Gramatika, Mauléon, Su-Azia, downloadable at: www.suazia.com/index.php?download=Xiberotarraren%20Gramatika Ohar batzuk nafar-lapurterazko galdera eta galdegai indartuez, Gramatika Jaietan: Patxi Goenagaren omenez, pp.195-208, 2007.

J. Mccloskey, Questions and questioning in a local English, Crosslinguistic Research in Syntax and Semantics: Negation, Tense, and Clausal Architecture, pp.87-126, 2006.

U. Ortiz-de and J. , Force phrases, Focus phrases and left heads in Basque, Grammatical analyses in Basque and Romance linguistics, pp.179-194, 1999.