Sometimes it's obvious a book is self published:
Sometimes it's less obvious but still can be seen:
... Ha, the author's description of that second book:
'Wolf Pack' is just a little post alien invasion story about the adventures of a lone surviving soldier who reluctantly take a 100 weepy, no-nothing wimpy females on a four hundred mile trek across the mountains...
NO-NOTHING WIMPY FEMALES.
I think someone here is a "no-nothing".
From the same description:
He was hundreds of miles inside alien held territory with no heavy weapons, no support, no Intel on the aliens, and no way to report the mission was a bust.