1930 US Census, Alabama, Mobile, Prichard, ED 11, Image 2 of 26
Problem: No Image Index available for this page; Nobody on this page can be sourced.
Curtis P Thompson, West Valley City, Utah
You're right that the image wasn't indexed, but you're wrong that this means that the people on this page can't be sourced. The lack of index means that the people are harder to find, but once they're found, you can just cite the image directly. There are actually multiple ways to do this, especially on an entirely-unindexed image like this, where the "Attach to Family Tree" button is available.
Here are a few relevant Help Center articles:
And here are instructions I wrote a month ago for attaching a partially-indexed image as a source to the people who were missed in the index: https://community.familysearch.org/en/discussion/comment/449832#Comment_449832.