For those who would like the cite the e-book (https://andysbrainbook.readthedocs.io/), you can use the following template:
"We followed the AFNI preprocessing pipeline as outlined in Andy's Brain Book (Jahn, 2022. doi:10.5281/zenodo.5879293)."
Thanks for Dan Bullock for advising me on how to do this with Zenodo, and for others who have asked for a way to cite the resource.
In addition, I have an announcement coming soon about new directions for this website and for the e-book; this will include new tutorials on software packages such as CAT12, methods such as FIR analysis and fixel-based analysis in MRtrix, and how to analyze data from large open-access repositories such as ADNI and the Human Connectome Project. Keeping current with the latest trends in neuroimaging analysis is the main goal of this blog, and I want to keep it up.