Subscription rates There are several categories of BISA membership and various ways to pay.  Political Studies Association (PSA) members receive a discount on BISA membership, please note membership is collected seperately by each organisation.  BISA membership runs for 12 months from the date of joining and you will receive BISA Benefits and Journals for that period only and depending on the membership type opted for.  Please note you need to be working, studying or researching in the field of International Studies to become a BISA member.