HM Revenue & Customs - www.hmrc.gov.uk/
Gray's Inn Tax Chamber - www.taxbar.com
Association of Taxation Technicians - www.att.org.uk
Institute of Indirect Taxation - www.theiit.org.uk
Tax Café UK Ltd - www.taxcafe.co.uk
TaxationWeb Ltd - www.taxationweb.co.uk
Taxation Institute of Australia - www.taxinstitute.com.au/
Federation of Tax Administrators (US) - www.taxadmin.org
Bundessteuerberaterkammer (Germany) - www.bstbk.de