Apache Reference: mod_log_referer

mod_log_referer - Specialized Referrer Logging (Deprecated)
Since Apache 1.0, src/modules/standard/mod_log_referer.c
The Apache Group (1995)

mod_log_referer is deprecated because it has been superseded by mod_==log_==config. It provides logging of the Referer HTTP header information.

Directives:

RefererIgnore

RefererLog