A. Bibliografía and G. , Auxiliary Verb Constructions, 2006.

J. Bybee, &. Dahl, and . Osten, «The creation of tense and aspect systems in the languages of the world», Studies in languages 13-1, pp.51-103, 1989.

B. , J. Perkings-revere, A. Pagliuca, and W. , The evolution of Grammar: Tense, Aspect and Modality in the Languages of the World, 1994.

H. , A. Campbell, and L. , Historical syntax in cross-linguistic perspective, 1995.

B. Heine, Auxiliaries: Cognitive Forces and Grammaticalisation, 1993.

H. , B. , and R. Mechthild, Grammaticalization and Reanalysis in African languages, 1984.

K. Hengeveld, Non-verbal predication: Theory, 1992.
DOI : 10.1515/9783110883282

K. Tania and S. Chris, «Spatial and Non-Spatial Uses of Prepositions: Conceptual Integrity Across Semantic Domains», pp.215-237, 1994.

T. and R. Larry, The history of Basque, 1997.