# Which reference could I cite for using confidence intervals instead of P-values when using robust linear mixed models (R package: robustlmm)?

I am using the R package robustlmm for some analysis due to its characteristics. I have read in posts like this one that with this type of models is better to use confidence intervals than $$p$$-values, however, I couldn't find any literature which says that.

Does anyone know any reference to cite for saying that I use confidence intervals instead of $$p$$-values?