What are common sources for athlete performance data?

The supplied source discusses the term GOAT in sports culture and mentions that objective measures such as statistics and championships are used to evaluate athletes. However, it does not specify which databases, organizations, or other repositories are commonly used to obtain those performance statistics. Without additional verified references, a detailed list of common data sources cannot be provided.

To accurately answer the question, references that identify official league statistics providers, sports analytics firms, or public data repositories would be required. In the absence of such evidence, any enumeration of specific sources would be speculative and could violate the anti‑hallucination rules.

If more targeted sources are supplied, a precise answer can be generated that cites those references.