Haspelmath, Martin. 2004. On directionality in language change with particular reference to grammaticalization. In Fischer, Olga and Norde, Muriel and Perridon, Harry (eds.), Up and down the Cline: The Nature of Grammaticalization. Amsterdam: Benjamins.
@incollection{jacquesestimative-haspelmath04directionality,
address = {Amsterdam},
author = {Haspelmath, Martin},
booktitle = {Up and down the Cline: The Nature of Grammaticalization},
editor = {Fischer, Olga and Norde, Muriel and Perridon, Harry},
publisher = {Benjamins},
title = {On directionality in language change with particular reference to grammaticalization},
year = {2004}
}