CIS Apache HTTP Server Benchmarks
https://www.cisecurity.org/benchmark/apache_http_server/
CIS Apache HTTP Server 2.4 Benchmark 2.0.0 Checklist Details
https://nvd.nist.gov/ncp/checklist/521
CIS Apache HTTP Server 2.4 Benchmark
https://security.uri.edu/files/CIS_Apache_HTTP_Server_2.4_Benchmark_v1.2.11.pdf
SANS – The most trusted source for cyber security training, certification, and research.
https://www.sans.org/