wie füge ich in der Datei chicago.bst den Punkt (.) vor dem Jahr hinzu?

Question

So fügen Sie den Punkt (.) vor dem Jahr (2012) in der Datei chicago.bst wie unten hinzu

Bergmann, H. und U. Stephan, (2012). Der Übergang vom Unternehmertum in die Selbstständigkeit: Messung länderübergreifender Unterschiede beim Übergang zum neuen Unternehmertum. Small Business Economics 41:945-959.

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ich habe den BIB-Eintrag unten hinzugefügt

@article{bs12,
author = {Bergmann, H. and U. Stephan},
title = {Moving on from nascent entrepreneurship: measuring cross-national 
         differences in the transition to new business ownership},
journal = {Small Business Economics},
volume = {41},
year = {2012},
pages = {945-959},
}

@article{bs12,
author = {Bergmann, H. and U. Stephan},
title = {Moving on from nascent entrepreneurship: measuring cross-national differences in the transition to new business ownership},
journal = {Small Business Economics},
volume = {41},
year = {2012},
pages = {945-959},
}

@ARTICLE{bgk10,
author = {Brinckmann, J. and D. Grichnik and D. Kapsa},
title = {Should entrepreneurs plan or just storm the castle? {A} meta-analysis on contextual factors impacrting the business planning-performance relationship in small firms},
journal = {Journal of Business Venturing},
volume = {25},
year = {2010},
pages = {24-40},
}

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 \documentclass[openany]{now}
   \begin{document}

   \nocite{*}
   \bibliographystyle{chicago}
   \bibliography{sample-bib}
   \end{document}