We usually cite as follows:
Z > 3.09 (P < 0.001) and cluster size > 189 mm3, which corresponded to a corrected P < 0.001. This correction was confined within the group GM mask (size: 1575720 mm3) and was determined by Monte Carlo simulations (Ledberg et al., 1998) using the AFNI AlphaSim program (http://afni.nih.gov/afni/docpdf/AlphaSim.pdf).
Alternatively, you can also cite REST AlphaSim (www.restfmri.net) if you use it.
Re
Z > 3.09 (P < 0.001) and cluster size > 189 mm3, which corresponded to a corrected P < 0.001. This correction was confined within the group GM mask (size: 1575720 mm3) and was determined by Monte Carlo simulations (Ledberg et al., 1998) using the AFNI AlphaSim program (http://afni.nih.gov/afni/docpdf/AlphaSim.pdf).
Alternatively, you can also cite REST AlphaSim (www.restfmri.net) if you use it.
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I will cite your website in my paper.