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From my understanding, the way I've done things here is okay.

The CC BY-SA license essentially says that you must attribute licensed work _in a [reasonable] manner specified by the licensor_. The licensor in this case is Stack Overflow - not the original authors; they are the licensor _to_ Stack Overflow, and Stack Overflow is the licensor for the use of content here. The manner in which Stack Overflow requires attribution to be made is detailed in the [Attribution Required blog post](https://stackoverflow.blog/2009/06/25/attribution-required/) (the requirements haven't changed):

> 1. **Visually indicate that the content is from Stack Overflow or the Stack Exchange network** in some way. It doesn’t have to be obnoxious; a discreet text blurb is fine.
> 2. **Hyperlink directly to the original question** on the source site (e.g., http://stackoverflow.com/questions/12345)
> 3. **Show the author names** for every question and answer
> 4. **Hyperlink each author name** directly back to their user profile page on the source site (e.g., http://stackoverflow.com/users/12345/username)

I'm particularly interested in point 3 there - only the _author_ names are required for each question and answer, not subsequent contributors.