What listservs or other communication channels can I access in order
to find a co-author for my undergraduate text on the psychology of
human experience: a human systems science perspective

What kind of euphemism is that?  A co-author for an undergraduate paper?
Some places you have to confirm that all the work you turn in is your own
effort.

I indicted that my co-author search was for a textbook (NOT a paper!)
for undergraduates.