Going away from printed manuals there are also no Reference Cards any more. I once created one for ACL/E and found it worth to publish it. If you find it handy download and print it, it is only one page!
When in doubt, the documentation on ACL/E which you find in docops.ca.com at https://docops.ca.com/ca-tpx-session-management/5-4/en/programming/acl-e-programming is authoritative.
Have fun,
Alexander