There are several publications about strucchange which describe different aspects of the software. The main reference is the JSS paper.

To cite strucchange in publications use:

Achim Zeileis, Friedrich Leisch, Kurt Hornik and Christian Kleiber (2002). strucchange: An R Package for Testing for Structural Change in Linear Regression Models. Journal of Statistical Software, 7(2), 1-38. URL http://www.jstatsoft.org/v07/i02/

If methods related to breakpoints() are used also cite:

Achim Zeileis, Christian Kleiber, Walter Kraemer and Kurt Hornik (2003). Testing and Dating of Structural Changes in Practice. Computational Statistics & Data Analysis, 44, 109-123.

If methods related to gefp() and efpFunctional() are used also cite:

Achim Zeileis (2006). Implementing a Class of Structural Change Tests: An Econometric Computing Approach. Computational Statistics & Data Analysis, 50, 2987-3008.

Corresponding BibTeX entries:

  @Article{,
    title = {strucchange: An R Package for Testing for Structural
      Change in Linear Regression Models},
    author = {Achim Zeileis and Friedrich Leisch and Kurt Hornik and
      Christian Kleiber},
    journal = {Journal of Statistical Software},
    year = {2002},
    volume = {7},
    number = {2},
    pages = {1--38},
    url = {http://www.jstatsoft.org/v07/i02/},
  }

  @Article{,
    title = {Testing and Dating of Structural Changes in Practice},
    author = {Achim Zeileis and Christian Kleiber and Walter Kr\"amer
      and Kurt Hornik},
    journal = {Computational Statistics \& Data Analysis},
    year = {2003},
    volume = {44},
    pages = {109--123},
  }

  @Article{,
    title = {Implementing a Class of Structural Change Tests: An
      Econometric Computing Approach},
    author = {Achim Zeileis},
    journal = {Computational Statistics \& Data Analysis},
    year = {2006},
    volume = {50},
    pages = {2987--3008},
  }