In APA 6.0 manual there is information (pp 113) about reporting degrees of freedom for Pearson correlation coefficient - and for parametric correlation it is sugested to report df's.
But what about nonparametric correlations? Should we report df's also or not? Is there any paper about it?
...Of course, I skip discussion on whether or not we should report df for nonparametric tests at all; I'm interested in APA standard guidelines/papers.