To cite package 'RQDA' in publications use:

Huang Ronggui. 2009. RQDA: R-based Qualitative Data Analysis. R package version 0.1-7.http://rqda.r-forge.r-project.org/.

@Manual{RQDA_rgHUANG,
    title = {RQDA: R-based Qualitative Data Analysis},
    author = {Ronggui HUANG},
    year = {2009},   
    url = {http://rqda.r-forge.r-project.org/}
}