citHeader("To cite package 'SixSigma' in publications use:")

     ## R >= 2.8.0 passes package metadata to citation().
     if(!exists("meta") || is.null(meta)) meta <- packageDescription("SixSigma")
     year <- sub(".*(2[[:digit:]]{3})-.*", "\\1", meta$Date)
     vers <- paste("R package version", meta$Version)

     citEntry(entry="Manual",
              title = "SixSigma: Six Sigma Tools for Quality Improvement",
              author = "Emilio L. Cano and Javier M. Moguerza and Andres Redchuk",
              year = year,
              note = vers,
              textVersion =
              paste("Emilio L. Cano, Andres Redchuk, Javier M.Moguerza, (",
                    year,"). SixSigma: Six Sigma Tools for Quality and Process Improvement ", vers, ".", sep=""))