- Campbell, Lyle: Historical Linguistics – An Introduction (Second Edition, 2004). Edinburgh University Press
- Comrie, Bernard: Language Universals and Linguistics Typology – Syntax and Morphology (siste utgave) Blackwell, Oxford.
Kompendium:
Shibatani, Masayoshi: Passive and related constructions: A prototype analysis, 1985. Tidsskrift: Language 61.4.
Kibirik, Aleksandr E. : Beyond subject and object: Toward a comprehensive relational typology, 1997. Tidsskrift: Linguistic Typology 1-3.
N?ss, ?shild: What markedness marks: The markedness problem with direct objects, 2005. Tidsskrift: LINGUA 114.