# Amazon GameLift Servers reference guides
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This section contains reference documentation for using Amazon GameLift Servers.

**Topics**
+ [Service API for Amazon GameLift Servers](reference-awssdk.md)
+ [Server SDK 5.x for Amazon GameLift Servers](reference-serversdk.md)
+ [Server SDK for Amazon GameLift Servers version 4 and earlier](reference-serversdk4.md)
+ [Game session placement events](queue-events.md)
+ [Amazon GameLift Servers AMI versions](reference-ec2-ami-version-history.md)
+ [Amazon GameLift Servers service locations](gamelift-regions.md)
+ [Amazon GameLift Servers endpoints and quotas](limits-regions.md)
+ [Amazon GameLift Servers API limits](api-limits-table.md)
+ [Amazon GameLift Servers SDK API limits](servers-api-limits-table.md)
+ [Amazon GameLift Servers UDP ping beacons](reference-udp-ping-beacons.md)