如何在chicago.bst 檔案中的年份前加入點(.)？

Question

如何在 Chicago.bst 文件中的年份 (2012) 之前新增點 (.)，如下所示

Bergmann, H. 與 U. Stephan, (2012)。從新生的創業精神繼續前進：衡量向新企業所有權過渡的跨國差異。小企業經濟學 41：945-959。

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我在下面添加了書目條目

@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}