Haspelmath, Martin. 1990. The grammaticalization of passive morphology. Studies in Language 14. 25-72.
@article{jacquesestimative-haspelmath90passive, author = {Haspelmath, Martin}, journal = {Studies in Language}, number = {1}, pages = {25-72}, title = {The grammaticalization of passive morphology}, volume = {14}, year = {1990} }