Autonomous System

Beginner

http://icons.apnic.net/pages/viewpage.action?pageId=491564

FAQ

http://www.apnic.net/services/services-apnic-provides/helpdesk/faqs/asn-faqs

Costing

http://www.apnic.net/services/become-a-member/how-much-does-it-cost

Artical

http://www.cisco.com/web/about/ac123/ac147/archived_issues/ipj_9-1/autonomous_system_numbers.html

Policy

http://www.apnic.net/policy/asn-policy

4 Byte AS

http://as4.cluepon.net/index.php/Main_Page