pfSense Firewall setup and Features in depth March 2016
pfSense: Adding firewall rules to filter services - Open Source For You
Setting Up a pfSense Network Firewall — SecureDrop stable documentation
Using the Journalist Workstation — SecureDrop stable documentation
Hardware — SecureDrop stable documentation
PfSense Setup and Initial Configuration
PfSense -- Guidance required : r/PFSENSE
pfSense Firewall HA Failover Cluster
Setting Up a pfSense Network Firewall — SecureDrop stable documentation
Using a YubiKey with the Journalist Interface — SecureDrop stable documentation
Setting Up a pfSense Network Firewall — SecureDrop stable documentation